Add UI extension point to password screen

This extension point is useful if a plugin wants to display
authentication tokens, e.g. for OAuth.

Change-Id: Ia809926af7a98f8fffa9c61125f43ac2c734f298
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

Documentation/dev-plugins.txt

@@ -994,6 +994,11 @@ Panel will be shown at the bottom of the screen.
 +
 The name of the project.
 
+* User Password Screen:
+** `GerritUiExtensionPoint.PASSWORD_SCREEN_BOTTOM`:
++
+Panel will be shown at the bottom of the screen.
+
 * User Profile Screen:
 ** `GerritUiExtensionPoint.PROFILE_SCREEN_BOTTOM`:
 +

gerrit-gwtui-common/src/main/java/com/google/gerrit/client/GerritUiExtensionPoint.java

@@ -18,6 +18,9 @@ public enum GerritUiExtensionPoint {
   /* ChangeScreen */
   CHANGE_SCREEN_BELOW_CHANGE_INFO_BLOCK,
 
+  /* MyPasswordScreen */
+  PASSWORD_SCREEN_BOTTOM,
+
   /* MyProfileScreen */
   PROFILE_SCREEN_BOTTOM,
 

gerrit-gwtui/src/main/java/com/google/gerrit/client/GerritCss.java

@@ -98,6 +98,7 @@ public interface GerritCss extends CssResource {
   String errorDialogErrorType();
   String errorDialogGlass();
   String errorDialogTitle();
+  String extensionPanel();
   String loadingPluginsDialog();
   String fileColumnHeader();
   String fileCommentBorder();

gerrit-gwtui/src/main/java/com/google/gerrit/client/account/MyPasswordScreen.java

@@ -15,7 +15,9 @@
 package com.google.gerrit.client.account;
 
 import com.google.gerrit.client.Gerrit;
+import com.google.gerrit.client.GerritUiExtensionPoint;
 import com.google.gerrit.client.VoidResult;
+import com.google.gerrit.client.api.ExtensionPanel;
 import com.google.gerrit.client.rpc.GerritCallback;
 import com.google.gerrit.client.rpc.NativeString;
 import com.google.gerrit.client.rpc.RestApi;
@@ -91,6 +93,10 @@ public class MyPasswordScreen extends SettingsScreen {
   @Override
   protected void onLoad() {
     super.onLoad();
+    ExtensionPanel extensionPanel =
+        new ExtensionPanel(GerritUiExtensionPoint.PASSWORD_SCREEN_BOTTOM);
+    extensionPanel.addStyleName(Gerrit.RESOURCES.css().extensionPanel());
+    add(extensionPanel);
 
     if (password == null) {
       display();

gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css

@@ -118,6 +118,10 @@ a:hover {
   cursor: pointer;
 }
 
+.extensionPanel {
+  padding-top: 10px;
+}
+
 /** MenuScreen **/
 .menuScreenMenuBar {
   background: topMenuColor;