Move scroll event handlers from layer to layer tree view.

cc/trees/layer_tree_host_impl.h

 // Copyright 2011 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 CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 665 matching lines @@
 
   void ClearCurrentlyScrollingLayer();
 
   void HandleMouseOverScrollbar(LayerImpl* layer_impl);
 
   LayerImpl* FindScrollLayerForDeviceViewportPoint(
       const gfx::PointF& device_viewport_point,
       InputHandler::ScrollInputType type,
       LayerImpl* layer_hit_by_point,
       bool* scroll_on_main_thread,
-      bool* optional_has_ancestor_scroll_handler,
       uint32_t* main_thread_scrolling_reason) const;
   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
                                    LayerImpl* layer_impl);
   void StartScrollbarFadeRecursive(LayerImpl* layer);
   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 
   void MarkUIResourceNotEvicted(UIResourceId uid);
   void ClearUIResources();
 
   void NotifySwapPromiseMonitorsOfSetNeedsRedraw();
@@ skipping 135 matching lines @@
   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 
   scoped_ptr<Viewport> viewport_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_