Fork a Polymer 2 version of gr-app

The webserver can then serve both versions depending on e.g. a URL
parameter.

Change-Id: I385a1937357077a6c8fa1d54818ab0afb827728b

polygerrit-ui/app/elements/gr-app-p2.html

@@ -0,0 +1,40 @@
+<!--
+@license
+Copyright (C) 2019 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+<script>
+  window.Gerrit = window.Gerrit || {};
+</script>
+
+<link rel="import" href="/bower_components/polymer/polymer.html">
+<link rel="import" href="/bower_components/polymer-resin/polymer-resin.html">
+<link rel="import" href="/bower_components/polymer/lib/legacy/legacy-data-mixin.html">
+<link rel="import" href="/bower_components/shadycss/apply-shim.html">
+<link rel="import" href="../behaviors/safe-types-behavior/safe-types-behavior.html">
+<script>
+  security.polymer_resin.install({
+    allowedIdentifierPrefixes: [''],
+    reportHandler: security.polymer_resin.CONSOLE_LOGGING_REPORT_HANDLER,
+    safeTypesBridge: Gerrit.SafeTypes.safeTypesBridge,
+  });
+</script>
+
+<link rel="import" href="./gr-app-element.html">
+<dom-module id="gr-app-p2">
+  <template>
+    <gr-app-element id="app-element"></gr-app-element>
+  </template>
+  <script src="gr-app-p2.js" crossorigin="anonymous"></script>
+</dom-module>

polygerrit-ui/app/elements/gr-app-p2.js

@@ -0,0 +1,23 @@
+/**
+ * @license
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+(function() {
+  'use strict';
+
+  Polymer({
+    is: 'gr-app-p2',
+  });
+})();

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

@@ -15,7 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <script>
-  if (!window.POLYMER2) {
   // This must be set prior to loading Polymer for the first time.
   if (localStorage.getItem('USE_SHADOW_DOM') === 'true') {
     window.Polymer = {
@@ -27,13 +26,11 @@ limitations under the License.
       passiveTouchGestures: true,
     };
   }
-  }
   window.Gerrit = window.Gerrit || {};
 </script>
 
 <link rel="import" href="/bower_components/polymer/polymer.html">
 <link rel="import" href="/bower_components/polymer-resin/standalone/polymer-resin.html">
-<link rel="import" href="/bower_components/polymer/lib/legacy/legacy-data-mixin.html">
 <link rel="import" href="../behaviors/safe-types-behavior/safe-types-behavior.html">
 <script>
   security.polymer_resin.install({

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

@@ -21,9 +21,7 @@
   // requestAnimationFrame.)
   // @see https://github.com/Polymer/polymer/issues/3851
   // @see Issue 4699
-  if (!window.POLYMER2) {
   Polymer.RenderStatus._makeReady();
-  }
 
   Polymer({
     is: 'gr-app',

resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy

@@ -79,7 +79,13 @@
   <link rel="preload" href="{$staticResourcePath}/fonts/Roboto-Medium.woff" as="font" type="font/woff" crossorigin="anonymous">{\n}
   <link rel="stylesheet" href="{$staticResourcePath}/styles/fonts.css">{\n}
   <link rel="stylesheet" href="{$staticResourcePath}/styles/main.css">{\n}
+
+  {if $polymer2}
+    <script src="{$staticResourcePath}/bower_components/webcomponentsjs-p2/webcomponents-lite.js"></script>{\n}
+  {else}
     <script src="{$staticResourcePath}/bower_components/webcomponentsjs/webcomponents-lite.js"></script>{\n}
+  {/if}
+
   // Content between webcomponents-lite and the load of the main app element
   // run before polymer-resin is installed so may have security consequences.
   // Contact your local security engineer if you have any questions, and
@@ -90,9 +96,18 @@
     <link rel="import" href="{$assetsPath}/{$assetsBundle}">{\n}
   {/if}
 
+  {if $polymer2}
+    <link rel="preload" href="{$staticResourcePath}/elements/gr-app-p2.js" as="script" crossorigin="anonymous">{\n}
+    <link rel="import" href="{$staticResourcePath}/elements/gr-app-p2.html">{\n}
+  {else}
     <link rel="preload" href="{$staticResourcePath}/elements/gr-app.js" as="script" crossorigin="anonymous">{\n}
     <link rel="import" href="{$staticResourcePath}/elements/gr-app.html">{\n}
+  {/if}
 
   <body unresolved>{\n}
+  {if $polymer2}
+    <gr-app-p2 id="app"></gr-app-p2>{\n}
+  {else}
     <gr-app id="app"></gr-app>{\n}
+  {/if}
 {/template}