Add autoresize capability for Chromium.

Source/WebCore/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 148 matching lines @@
         virtual void scrollbarsModeDidChange() const = 0;
         virtual void setCursor(const Cursor&) = 0;
         virtual void setCursorHiddenUntilMouseMoves(bool) = 0;
 #if ENABLE(REQUEST_ANIMATION_FRAME) && !USE(REQUEST_ANIMATION_FRAME_TIMER)
         virtual void scheduleAnimation() = 0;
 #endif
         // End methods used by HostWindow.
 
         virtual void dispatchViewportPropertiesDidChange(const ViewportArguments&) const { }
 
+        virtual void layoutBeforeScrollbarUpdate(Frame*) { }
         virtual void contentsSizeChanged(Frame*, const IntSize&) const = 0;
         virtual void layoutUpdated(Frame*) const { }
         virtual void scrollRectIntoView(const IntRect&) const { }; // Currently only Mac has a non empty implementation.
        
         virtual bool shouldMissingPluginMessageBeButton() const { return false; }
         virtual void missingPluginButtonClicked(Element*) const { }
         virtual void mouseDidMoveOverElement(const HitTestResult&, unsigned modifierFlags) = 0;
 
         virtual void setToolTip(const String&, TextDirection) = 0;
 
@@ skipping 159 matching lines @@
         
         virtual bool isSVGImageChromeClient() const { return false; }
 
     protected:
         virtual ~ChromeClient() { }
     };
 
 }
 
 #endif // ChromeClient_h