Update WebLocalFrameImpl and RotationViewportAnchor for root layer scrolling.

Source/web/WebLocalFrameImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 339 matching lines @@
     friend class FrameLoaderClientImpl;
 
     WebLocalFrameImpl(WebTreeScopeType, WebFrameClient*);
 
     // Sets the local core frame and registers destruction observers.
     void setCoreFrame(PassRefPtrWillBeRawPtr<LocalFrame>);
 
     void loadJavaScriptURL(const KURL&);
 
     WebPlugin* focusedPluginIfInputMethodSupported();
+    ScrollableArea* layoutViewportScrollableArea() const;
 
     FrameLoaderClientImpl m_frameLoaderClientImpl;
 
     // The embedder retains a reference to the WebCore LocalFrame while it is active in the DOM. This
     // reference is released when the frame is removed from the DOM or the entire page is closed.
     // FIXME: These will need to change to WebFrame when we introduce WebFrameProxy.
     RefPtrWillBeMember<LocalFrame> m_frame;
 
     OwnPtrWillBeMember<InspectorOverlay> m_inspectorOverlay;
     OwnPtrWillBeMember<WebDevToolsAgentImpl> m_devToolsAgent;
@@ skipping 35 matching lines @@
     GC_PLUGIN_IGNORE("340522")
     Persistent<WebLocalFrameImpl> m_selfKeepAlive;
 #endif
 };
 
 DEFINE_TYPE_CASTS(WebLocalFrameImpl, WebFrame, frame, frame->isWebLocalFrame(), frame.isWebLocalFrame());
 
 } // namespace blink
 
 #endif