Inline signin UI should auto focus gaia frame

chrome/browser/resources/gaia_auth/main.js

 // Copyright (c) 2012 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.
 
 /**
  * Authenticator class wraps the communications between Gaia and its host.
  */
 function Authenticator() {
 }
 
@@ skipping 170 matching lines @@
       'method': 'authPageLoaded',
       'isSAML': this.samlPageLoaded_
     }, this.parentPage_);
   },
 
   onLoginUILoaded: function() {
     var msg = {
       'method': 'loginUILoaded'
     };
     window.parent.postMessage(msg, this.parentPage_);
+    if (this.inlineMode_) {
+      $('gaia-frame').focus();
+    }
   },
 
   onConfirmLogin_: function() {
     if (!this.samlPageLoaded_) {
       this.completeLogin(this.email_, this.password_);
       return;
     }
 
     this.samlSupportChannel_.sendWithCallback(
         {name: 'getScrapedPasswords'},
@@ skipping 52 matching lines @@
     } else if (msg.method == 'navigate' &&
                this.isParentMessage_(e)) {
        $('gaia-frame').src = msg.src;
     } else {
       console.error('Authenticator.onMessage: unknown message + origin!?');
     }
   }
 };
 
 Authenticator.getInstance().initialize();