Move scroll event handlers from layer to layer tree view.

third_party/WebKit/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 183 matching lines @@
 
     virtual void enterFullScreenForElement(Element*) { }
     virtual void exitFullScreenForElement(Element*) { }
 
     virtual void clearCompositedSelection() { }
     virtual void updateCompositedSelection(const CompositedSelection&) { }
 
     virtual void needTouchEvents(bool) = 0;
     virtual void setHaveWheelEventHandlers(bool) = 0;
     virtual bool haveWheelEventHandlers() const = 0;
+    virtual void setHaveScrollEventHandlers(bool) = 0;
+    virtual bool haveScrollEventHandlers() const = 0;
 
     virtual void setTouchAction(TouchAction) = 0;
 
     // Checks if there is an opened popup, called by LayoutMenuList::showPopup().
     virtual bool hasOpenedPopup() const = 0;
     virtual PassRefPtrWillBeRawPtr<PopupMenu> openPopupMenu(LocalFrame&, HTMLSelectElement&) = 0;
     virtual DOMWindow* pagePopupWindowForTesting() const = 0;
 
     virtual void postAccessibilityNotification(AXObject*, AXObjectCache::AXNotification) { }
     virtual String acceptLanguages() = 0;
@@ skipping 65 matching lines @@
 
     LayoutPoint m_lastToolTipPoint;
     String m_lastToolTipText;
 
     FRIEND_TEST_ALL_PREFIXES(ChromeClientTest, SetToolTipFlood);
 };
 
 } // namespace blink
 
 #endif // ChromeClient_h