Add more jsdoc for closure checks

1. add `@extends` for all polymer elements
2. add `@override` for all lifecycle methods
3. fix a wrong type in gr-auth

Change-Id: Id9dea76b169197084d2e0b5f267459cdc4aaec3e

polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js

@@ -49,6 +49,7 @@
       },
     },
 
+    /** @override */
     detached() {
       this._handleHideTooltip();
     },

polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html

@@ -540,6 +540,7 @@ shortcuts are.
         }
       },
 
+      /** @override */
       attached() {
         const shortcuts = shortcutManager.attachHost(this);
         if (!shortcuts) { return; }
@@ -559,6 +560,7 @@ shortcuts are.
         }
       },
 
+      /** @override */
       detached() {
         if (shortcutManager.detachHost(this)) {
           this.removeOwnKeyBindings();

polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.js

@@ -40,6 +40,7 @@
   /**
    * @appliesMixin Gerrit.AccessMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrAccessSection extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -84,6 +85,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-saved',

polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.js

@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrAdminGroupList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -77,6 +78,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getCreateGroupCapability();

polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.js

@@ -23,6 +23,7 @@
    * @appliesMixin Gerrit.AdminNavMixin
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrAdminView extends Polymer.mixinBehaviors( [
     Gerrit.AdminNavBehavior,
@@ -82,6 +83,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.reload();

polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.js

@@ -25,6 +25,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmDeleteItemDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.js

@@ -24,6 +24,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreateChangeDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -64,6 +65,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (!this.repoName) { return Promise.resolve(); }

polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.js

@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreateGroupDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,

polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.js

@@ -25,6 +25,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreatePointerDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,

polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.js

@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreateRepoDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,

polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.js

@@ -22,6 +22,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrGroupAuditLog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -42,11 +43,13 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.fire('title-change', {title: 'Audit Log'});
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._getAuditLogs();

polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.js

@@ -27,6 +27,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrGroupMembers extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -76,6 +77,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadGroupDetails();

polygerrit-ui/app/elements/admin/gr-group/gr-group.js

@@ -32,6 +32,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrGroup extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -105,6 +106,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadGroup();

polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js

@@ -37,6 +37,7 @@
    * Fired when a permission that was previously added was removed.
    *
    * @event added-permission-removed
+   * @extends Polymer.Element
    */
   class GrPermission extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -94,12 +95,14 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-saved',
           () => this._handleAccessSaved());
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._setupValues();

polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPluginConfigArrayEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.js

@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrPluginList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -74,6 +75,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.fire('title-change', {title: 'Plugins'});

polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.js

@@ -72,6 +72,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRepoAccess extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -128,6 +129,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-modified',

polygerrit-ui/app/elements/admin/gr-repo-command/gr-repo-command.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrRepoCommand extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js

@@ -28,6 +28,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRepoCommands extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -50,6 +51,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadRepo();

polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRepoDashboards extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.js

@@ -28,6 +28,7 @@
    * @appliesMixin Gerrit.ListViewMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRepoDetailList extends Polymer.mixinBehaviors( [
     Gerrit.ListViewBehavior,

polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrRepoList extends Polymer.mixinBehaviors( [
     Gerrit.ListViewBehavior,
@@ -78,6 +79,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getCreateRepoCapability();

polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.RepoPluginConfigMixin
+   * @extends Polymer.Element
    */
   class GrRepoPluginConfig extends Polymer.mixinBehaviors( [
     Gerrit.RepoPluginConfig,

polygerrit-ui/app/elements/admin/gr-repo/gr-repo.js

@@ -53,6 +53,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRepo extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -123,6 +124,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadRepo();

polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js

@@ -69,6 +69,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRuleEditor extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -118,12 +119,14 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-saved',
           () => this._handleAccessSaved());
     }
 
+    /** @override */
     ready() {
       super.ready();
       // Called on ready rather than the observer because when new rules are
@@ -132,6 +135,7 @@
       this._setupValues(this.rule);
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (!this.rule) { return; } // Check needed for test purposes.

polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js

@@ -30,6 +30,7 @@
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.RESTClientMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrChangeListItem extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -74,6 +75,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       Gerrit.awaitPluginsLoaded().then(() => {

polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js

@@ -33,6 +33,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrChangeListView extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -133,6 +134,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('next-page',
@@ -141,6 +143,7 @@
           () => this._handlePreviousPage());
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadPreferences();

polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js

@@ -29,6 +29,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.RESTClientMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrChangeList extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -135,17 +136,20 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('keydown',
           e => this._scopedKeydownHandler(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('tabindex', 0);
     }
 
+    /** @override */
     attached() {
       super.attached();
       Gerrit.awaitPluginsLoaded().then(() => {

polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrCreateChangeHelp extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js

@@ -23,6 +23,7 @@
     PUSH_PREFIX: 'git push origin HEAD:refs/for/',
   };
 
+  /** @extends Polymer.Element */
   class GrCreateCommandsDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js

@@ -22,6 +22,7 @@
    * name and the branch name.
    *
    * @event confirm
+   * @extends Polymer.Element
    */
   class GrCreateDestinationDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(

polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js

@@ -22,6 +22,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDashboardView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -94,6 +95,7 @@
       );
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadPreferences();

polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEmbedDashboard extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrRepoHeader extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js

@@ -17,6 +17,9 @@
 (function() {
   'use strict';
 
+  /**
+   * @extends Polymer.Element
+   */
   class GrUserHeader extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js

@@ -196,6 +196,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeActions extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -432,6 +433,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('fullscreen-overlay-opened',
@@ -440,6 +442,7 @@
           () => this._handleShowBackgroundContent());
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.jsAPI.addElement(this.$.jsAPI.Element.CHANGE_ACTIONS, this);

polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js

@@ -50,6 +50,7 @@
 
   /**
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeMetadata extends Polymer.mixinBehaviors( [
     Gerrit.RESTClientBehavior,

polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeRequirements extends Polymer.mixinBehaviors( [
     Gerrit.RESTClientBehavior,

polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js

@@ -68,6 +68,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -324,6 +325,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
 
@@ -346,6 +348,7 @@
           () => this._handleReloadCommentThreads());
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getServerConfig().then(config => {
@@ -391,6 +394,7 @@
       this.listen(document, 'visibilitychange', '_handleVisibilityChange');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'scroll', '_handleScroll');

polygerrit-ui/app/elements/change/gr-comment-list/gr-comment-list.js

@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCommentList extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,

polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrCommitInfo extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.js

@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrConfirmAbandonDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmCherrypickConflictDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.js

@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmCherrypickDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.js

@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmMoveDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrConfirmRebaseDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js

@@ -22,6 +22,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmRevertDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog.js

@@ -23,6 +23,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmRevertSubmissionDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrConfirmSubmitDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog.js

@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDownloadDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -54,6 +55,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'dialog');

polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.js

@@ -24,6 +24,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrFileListHeader extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js

@@ -48,6 +48,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.PathListMixin
+   * @extends Polymer.Element
    */
   class GrFileList extends Polymer.mixinBehaviors( [
     Gerrit.AsyncForeachBehavior,
@@ -236,12 +237,14 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('keydown',
           e => this._scopedKeydownHandler(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       Gerrit.awaitPluginsLoaded().then(() => {
@@ -265,6 +268,7 @@
       });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this._cancelDiffs();

polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrIncludedInDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLabelScoreRow extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLabelScores extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-message/gr-message.js

@@ -22,6 +22,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrMessage extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -113,12 +114,14 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('click',
           e => this._handleClick(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.restAPI.getConfig().then(config => {

polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js

@@ -25,6 +25,7 @@
     SHOW_MORE: 'show-more-messages',
   };
 
+  /** @extends Polymer.Element */
   class GrMessagesList extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js

@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrRelatedChangesList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js

@@ -58,6 +58,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrReplyDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -249,6 +250,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getAccount().then(account => {
@@ -256,6 +258,7 @@
       });
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.jsAPI.addElement(this.$.jsAPI.Element.REPLY_DIALOG, this);

polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrReviewerList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.js

@@ -21,6 +21,7 @@
    * Fired when a comment is saved or deleted
    *
    * @event thread-list-modified
+   * @extends Polymer.Element
    */
   class GrThreadList extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(

polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.js

@@ -29,6 +29,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrUploadHelpDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -65,6 +66,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.$.restAPI.getLoggedIn()

polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.js

@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.DisplayNameMixin
+   * @extends Polymer.Element
    */
   class GrAccountDropdown extends Polymer.mixinBehaviors( [
     Gerrit.DisplayNameBehavior,
@@ -50,6 +51,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._handleLocationChange();
@@ -66,6 +68,7 @@
       });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'location-change', '_handleLocationChange');

polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrErrorDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.js

@@ -28,6 +28,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrErrorManager extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -74,6 +75,7 @@
       this._authErrorHandlerDeregistrationHook;
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.listen(document, 'server-error', '_handleServerError');
@@ -89,6 +91,7 @@
           });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this._clearHideAlertHandle();

polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrKeyBindingDisplay extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.js

@@ -22,6 +22,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrKeyboardShortcutsDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -59,17 +60,20 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'dialog');
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.addKeyboardShortcutDirectoryListener(
           this._onDirectoryUpdated.bind(this));
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.removeKeyboardShortcutDirectoryListener(

polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js

@@ -74,6 +74,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.DocsUrlMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrMainHeader extends Polymer.mixinBehaviors( [
     Gerrit.AdminNavBehavior,
@@ -150,11 +151,13 @@
       ];
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'banner');
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadAccount();
@@ -162,6 +165,7 @@
       this.listen(window, 'location-change', '_handleLocationChange');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'location-change', '_handleLocationChange');

polygerrit-ui/app/elements/core/gr-router/gr-router.js

@@ -214,6 +214,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRouter extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,

polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js

@@ -107,6 +107,7 @@
   /**
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrSearchBar extends Polymer.mixinBehaviors( [
     Gerrit.KeyboardShortcutBehavior,

polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.js

@@ -23,6 +23,7 @@
 
   /**
    * @appliesMixin Gerrit.DisplayNameMixin
+   * @extends Polymer.Element
    */
   class GrSmartSearch extends Polymer.mixinBehaviors( [
     Gerrit.DisplayNameBehavior,
@@ -56,6 +57,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.$.restAPI.getConfig().then(cfg => {

polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.js

@@ -466,6 +466,7 @@
 
   /**
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrCommentApi extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,
@@ -480,6 +481,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('reload-drafts',

polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer.js

@@ -24,6 +24,7 @@
     [Gerrit.CoverageType.NOT_INSTRUMENTED, 'Not instrumented by any tests.'],
   ]);
 
+  /** @extends Polymer.Element */
   class GrCoverageLayer extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.js

@@ -35,6 +35,7 @@
   const LEFT_SIDE_CLASS = 'target-side-left';
   const RIGHT_SIDE_CLASS = 'target-side-right';
 
+  /** @extends Polymer.Element */
   class GrDiffCursor extends Polymer.mixinBehaviors([Gerrit.FireBehavior],
       Polymer.GestureEventListeners(
           Polymer.LegacyElementMixin(Polymer.Element))) {
@@ -105,6 +106,7 @@
       ];
     }
 
+    /** @override */
     ready() {
       super.ready();
       Polymer.RenderStatus.afterNextRender(this, () => {
@@ -122,12 +124,14 @@
       });
     }
 
+    /** @override */
     attached() {
       super.attached();
       // Catch when users are scrolling as the view loads.
       this.listen(window, 'scroll', '_handleWindowScroll');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'scroll', '_handleWindowScroll');

polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrDiffHighlight extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -57,6 +58,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('comment-thread-mouseleave',

polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js

@@ -77,6 +77,8 @@
    *
    * Webcomponent fetching diffs and related data from restAPI and passing them
    * to the presentational gr-diff for rendering.
+   *
+   * @extends Polymer.Element
    */
   class GrDiffHost extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -249,6 +251,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener(
@@ -276,6 +279,7 @@
           event => this._handleDiffContextExpanded(event));
     }
 
+    /** @override */
     ready() {
       super.ready();
       if (this._canReload()) {
@@ -283,6 +287,7 @@
       }
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getLoggedIn().then(loggedIn => {

polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrDiffModeSelector extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrDiffPreferencesDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,

polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.js

@@ -63,6 +63,8 @@
    *    "expand context" widget. This may require splitting a chunk/group so
    *    that the part that is within the context or has comments is shown, while
    *    the rest is not.
+   *
+   * @extends Polymer.Element
    */
   class GrDiffProcessor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
@@ -119,11 +121,13 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.listen(window, 'scroll', '_handleWindowScroll');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.cancel();

polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection.js

@@ -32,6 +32,7 @@
 
   /**
    * @appliesMixin Gerrit.DomUtilMixin
+   * @extends Polymer.Element
    */
   class GrDiffSelection extends Polymer.mixinBehaviors( [
     Gerrit.DomUtilBehavior,
@@ -58,6 +59,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('copy',
@@ -66,6 +68,7 @@
           e => this._handleDown(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.classList.add(SelectionClass.RIGHT);

polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js

@@ -39,6 +39,7 @@
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDiffView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -244,6 +245,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getLoggedIn().then(loggedIn => {

polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js

@@ -94,6 +94,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrDiff extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -284,6 +285,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('create-range-comment',
@@ -292,11 +294,13 @@
           () => this._handleRenderContent());
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._observeNodes();
     }
 
+    /** @override */
     detached() {
       super.detached();
       this._unobserveIncrementalNodes();

polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.js

@@ -30,6 +30,7 @@
    *
    * @property {string} patchNum
    * @property {string} basePatchNum
+   * @extends Polymer.Element
    */
   class GrPatchRangeSelect extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,

polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer.js

@@ -23,6 +23,7 @@
   const RANGE_HIGHLIGHT = 'style-scope gr-diff range';
   const HOVER_HIGHLIGHT = 'style-scope gr-diff rangeHighlight';
 
+  /** @extends Polymer.Element */
   class GrRangedCommentLayer extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrSelectionActionBox extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -42,6 +43,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
 

polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js

@@ -131,6 +131,7 @@
   const GO_BACKSLASH_LITERAL = '\'\\\\\'';
   const GLOBAL_LT_PATTERN = /</g;
 
+  /** @extends Polymer.Element */
   class GrSyntaxLayer extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrDocumentationSearch extends Polymer.mixinBehaviors( [
     Gerrit.ListViewBehavior,
@@ -55,6 +56,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.dispatchEvent(

polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrDefaultEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js

@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrEditControls extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,

polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEditFileControls extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js

@@ -29,6 +29,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.PathListMixin
+   * @extends Polymer.Element
    */
   class GrEditorView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -92,12 +93,14 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('content-change',
           e => this._handleContentChange(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getEditPrefs().then(prefs => { this._prefs = prefs; });

polygerrit-ui/app/elements/gr-app-element.js

@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrAppElement extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -114,6 +115,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this._bindKeyboardShortcuts();
@@ -127,6 +129,7 @@
           e => this._handleRpcLog(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.reporting.appStarted();

polygerrit-ui/app/elements/gr-app.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrApp extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.js

@@ -41,6 +41,7 @@
     return this._hooks[hookName];
   };
 
+  /** @constructor */
   function GrDomHook(hookName, opt_moduleName) {
     this._instances = [];
     this._callbacks = [];

polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.js

@@ -19,6 +19,7 @@
 
   const INIT_PROPERTIES_TIMEOUT_MS = 10000;
 
+  /** @extends Polymer.Element */
   class GrEndpointDecorator extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -46,6 +47,7 @@
       };
     }
 
+    /** @override */
     detached() {
       super.detached();
       for (const [el, domHook] of this._domHooks) {
@@ -145,6 +147,7 @@
       });
     }
 
+    /** @override */
     ready() {
       super.ready();
       Gerrit._endpoints.onNewEndpoint(this.name, this._initModule.bind(this));

polygerrit-ui/app/elements/plugins/gr-endpoint-param/gr-endpoint-param.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEndpointParam extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrExternalStyle extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -73,11 +74,13 @@
       });
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._importAndApply();
     }
 
+    /** @override */
     ready() {
       super.ready();
       Gerrit.awaitPluginsLoaded().then(() => this._importAndApply());

polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.js

@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPluginHost extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup.js

@@ -17,6 +17,7 @@
 (function(window) {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPluginPopup extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {

polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api_test.html

@@ -65,6 +65,7 @@ limitations under the License.
       setup(() => {
         fixture('header-title');
         stub('gr-custom-plugin-header', {
+          /** @override */
           ready() { customHeader = this; },
         });
         Gerrit._loadPlugins([]);