Move scroll event handlers from layer to layer tree view.

content/renderer/gpu/render_widget_compositor.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 #define CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 119 matching lines @@
   void registerViewportLayers(
       const blink::WebLayer* overscrollElasticityLayer,
       const blink::WebLayer* pageScaleLayer,
       const blink::WebLayer* innerViewportScrollLayer,
       const blink::WebLayer* outerViewportScrollLayer) override;
   void clearViewportLayers() override;
   void registerSelection(const blink::WebSelection& selection) override;
   void clearSelection() override;
   void setHaveWheelEventHandlers(bool) override;
   bool haveWheelEventHandlers() const override;
+  void setHaveScrollEventHandlers(bool) override;
+  bool haveScrollEventHandlers() const override;
   int layerTreeId() const override;
   void setShowFPSCounter(bool show) override;
   void setShowPaintRects(bool show) override;
   void setShowDebugBorders(bool show) override;
   void setShowScrollBottleneckRects(bool show) override;
 
   void updateTopControlsState(blink::WebTopControlsState constraints,
                               blink::WebTopControlsState current,
                               bool animate) override;
   void setTopControlsHeight(float height, bool shrink) override;
@@ skipping 60 matching lines @@
   scoped_ptr<cc::CopyOutputRequest> temporary_copy_output_request_;
 
   cc::RemoteProtoChannel::ProtoReceiver* remote_proto_channel_receiver_;
 
   base::WeakPtrFactory<RenderWidgetCompositor> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_