Move scroll event handlers from layer to layer tree view.

third_party/WebKit/Source/core/loader/EmptyClients.h

 /*
  * Copyright (C) 2006 Eric Seidel (eric@webkit.org)
  * Copyright (C) 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.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 141 matching lines @@
     void openFileChooser(LocalFrame*, PassRefPtr<FileChooser>) override;
 
     void setCursor(const Cursor&, LocalFrame* localRoot) override {}
     Cursor lastSetCursorForTesting() const override { return pointerCursor(); }
 
     void attachRootGraphicsLayer(GraphicsLayer*, LocalFrame* localRoot) override {}
 
     void needTouchEvents(bool) override {}
     void setHaveWheelEventHandlers(bool) override {}
     bool haveWheelEventHandlers() const override { return false; }
+    void setHaveScrollEventHandlers(bool) override {}
+    bool haveScrollEventHandlers() const override { return false; }
 
     void setTouchAction(TouchAction) override {}
 
     void didAssociateFormControls(const WillBeHeapVector<RefPtrWillBeMember<Element>>&, LocalFrame*) override {}
 
     void annotatedRegionsChanged() override {}
     String acceptLanguages() override;
 
     void registerPopupOpeningObserver(PopupOpeningObserver*) override {}
     void unregisterPopupOpeningObserver(PopupOpeningObserver*) override {}
@@ skipping 162 matching lines @@
     ~EmptyDragClient() override {}
     DragDestinationAction actionMaskForDrag(DragData*) override { return DragDestinationActionNone; }
     void startDrag(DragImage*, const IntPoint&, const IntPoint&, DataTransfer*, LocalFrame*, bool) override {}
 };
 
 CORE_EXPORT void fillWithEmptyClients(Page::PageClients&);
 
 } // namespace blink
 
 #endif // EmptyClients_h