add previously focused node to WebClient::focusedNodeChanged

Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 66 matching lines @@
     virtual void setWindowRect(const FloatRect&) = 0;
     virtual FloatRect windowRect() = 0;
 
     virtual FloatRect pageRect() = 0;
 
     virtual void focus() = 0;
 
     virtual bool canTakeFocus(FocusType) = 0;
     virtual void takeFocus(FocusType) = 0;
 
-    virtual void focusedNodeChanged(Node*) = 0;
+    virtual void focusedNodeChanged(Node*, Node*) = 0;
 
     virtual void focusedFrameChanged(LocalFrame*) = 0;
 
     // The LocalFrame pointer provides the ChromeClient with context about which
     // LocalFrame wants to create the new Page. Also, the newly created window
     // should not be shown to the user until the ChromeClient of the newly
     // created Page has its show method called.
     // The FrameLoadRequest parameter is only for ChromeClient to check if the
     // request could be fulfilled. The ChromeClient should not load the request.
     virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy, ShouldSendReferrer) = 0;
@@ skipping 139 matching lines @@
 
     virtual void registerViewportLayers() const { }
 
 protected:
     virtual ~ChromeClient() { }
 };
 
 } // namespace blink
 
 #endif // ChromeClient_h