Focus <webview> when Signin focused

chrome/browser/resources/gaia_auth_host/authenticator.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview An UI component to authenciate to Chrome. The component hosts
  * IdP web pages in a webview. A client who is interested in monitoring
  * authentication events should pass a listener object of type
  * cr.login.GaiaAuthHost.Listener as defined in this file. After initialization,
  * call {@code load} to start the authentication flow.
@@ skipping 111 matching lines @@
         {urls: ['*://*/*', this.continueUrlWithoutParams_ + '*'],
             types: ['main_frame']},
         ['responseHeaders']);
     this.webview_.request.onHeadersReceived.addListener(
         this.onHeadersReceived_.bind(this),
         {urls: [this.idpOrigin_ + '*'], types: ['main_frame']},
         ['responseHeaders']);
     window.addEventListener(
         'message', this.onMessageFromWebview_.bind(this), false);
     window.addEventListener(
+        'focus', this.onFocus_.bind(this), false);
+    window.addEventListener(
         'popstate', this.onPopState_.bind(this), false);
 
     this.loaded_ = false;
   };
 
   /**
    * Reloads the authenticator component.
    */
   Authenticator.prototype.reload = function() {
     this.webview_.src = this.reloadUrl_;
@@ skipping 64 matching lines @@
     * @private
     */
   Authenticator.prototype.updateHistoryState_ = function(url) {
     if (history.state && history.state.url != url)
       history.pushState({url: url}, '');
     else
       history.replaceState({url: url});
   };
 
   /**
+   * Invoked when the sign-in page takes focus.
+   * @param {object} e The focus event being triggered.
+   * @private
+   */
+  Authenticator.prototype.onFocus_ = function(e) {
+    this.webview_.focus();
+  };
+
+  /**
    * Invoked when the history state is changed.
    * @param {object} e The popstate event being triggered.
    * @private
    */
   Authenticator.prototype.onPopState_ = function(e) {
     var state = e.state;
     if (state && state.url)
       this.webview_.src = state.url;
   };
 
@@ skipping 95 matching lines @@
   Authenticator.AuthFlow = AuthFlow;
   Authenticator.AuthMode = AuthMode;
   Authenticator.SUPPORTED_PARAMS = SUPPORTED_PARAMS;
 
   return {
     // TODO(guohui, xiyuan): Rename GaiaAuthHost to Authenticator once the old
     // iframe-based flow is deprecated.
     GaiaAuthHost: Authenticator
   };
 });