Move scroll event handlers from layer to layer tree view.

cc/trees/layer_tree_host.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_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 206 matching lines @@
                               scoped_refptr<Layer> outer_viewport_scroll_layer);
   Layer* inner_viewport_scroll_layer() const {
     return inner_viewport_scroll_layer_.get();
   }
   Layer* outer_viewport_scroll_layer() const {
     return outer_viewport_scroll_layer_.get();
   }
 
   void RegisterSelection(const LayerSelection& selection);
 
+  bool have_scroll_event_handlers() const {
+    return have_scroll_event_handlers_;
+  }
+  void SetHaveScrollEventHandlers(bool have_event_handlers);
+
   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
   void SetHaveWheelEventHandlers(bool have_event_handlers);
 
   const LayerTreeSettings& settings() const { return settings_; }
 
   void SetDebugState(const LayerTreeDebugState& debug_state);
   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 
   bool has_gpu_rasterization_trigger() const {
     return has_gpu_rasterization_trigger_;
@@ skipping 288 matching lines @@
   float min_page_scale_factor_;
   float max_page_scale_factor_;
   gfx::Vector2dF elastic_overscroll_;
   bool has_gpu_rasterization_trigger_;
   bool content_is_suitable_for_gpu_rasterization_;
   bool gpu_rasterization_histogram_recorded_;
 
   SkColor background_color_;
   bool has_transparent_background_;
 
+  bool have_scroll_event_handlers_;
   bool have_wheel_event_handlers_;
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
   scoped_ptr<AnimationHost> animation_host_;
 
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
   // If set, then page scale animation has completed, but the client hasn't been
   // notified about it yet.
   bool did_complete_scale_animation_;
@@ skipping 24 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_