Fix white virtual keyboard at login screen

ui/keyboard/keyboard_controller_proxy.cc

 // Copyright (c) 2013 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.
 
 #include "ui/keyboard/keyboard_controller_proxy.h"
 
 #include "base/command_line.h"
 #include "base/values.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 32 matching lines @@
   }
 
   virtual bool IsPopupOrPanel(
       const content::WebContents* source) const OVERRIDE {
     return true;
   }
 
   virtual void MoveContents(content::WebContents* source,
                             const gfx::Rect& pos) OVERRIDE {
     aura::Window* keyboard = proxy_->GetKeyboardWindow();
+    // keyboard window must have been added to keyboard container window at this
+    // point. Otherwise, wrong keyboard bounds is used and may cause problem as
+    // described in crbug.com/367788.
+    DCHECK(keyboard->parent());
     gfx::Rect bounds = keyboard->bounds();
     int new_height = pos.height();
     bounds.set_y(bounds.y() + bounds.height() - new_height);
     bounds.set_height(new_height);
     keyboard->SetBounds(bounds);
   }
 
   // Overridden from content::WebContentsDelegate:
   virtual void RequestMediaAccessPermission(content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
@@ skipping 91 matching lines @@
   DCHECK(keyboard_contents_);
   if (keyboard_contents_->GetURL() != GetVirtualKeyboardUrl()) {
     LoadContents(GetVirtualKeyboardUrl());
   }
 }
 
 void KeyboardControllerProxy::SetupWebContents(content::WebContents* contents) {
 }
 
 }  // namespace keyboard