Move scroll event handlers from layer to layer tree view.

cc/layers/layer_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_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 485 matching lines @@
   void ApplySentScrollDeltasFromAbortedCommit();
 
   void set_main_thread_scrolling_reasons(
       uint32_t main_thread_scrolling_reasons) {
     main_thread_scrolling_reasons_ = main_thread_scrolling_reasons;
   }
   bool should_scroll_on_main_thread() const {
     return !!main_thread_scrolling_reasons_;
   }
 
-  void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
-    have_scroll_event_handlers_ = have_scroll_event_handlers;
-  }
-  bool have_scroll_event_handlers() const {
-    return have_scroll_event_handlers_;
-  }
-
   void SetNonFastScrollableRegion(const Region& region) {
     non_fast_scrollable_region_ = region;
   }
   const Region& non_fast_scrollable_region() const {
     return non_fast_scrollable_region_;
   }
 
   void SetTouchEventHandlerRegion(const Region& region) {
     touch_event_handler_region_ = region;
   }
@@ skipping 231 matching lines @@
   scoped_refptr<SyncedScrollOffset> scroll_offset_;
   gfx::Vector2dF bounds_delta_;
 
   // Properties synchronized from the associated Layer.
   gfx::Point3F transform_origin_;
   gfx::Size bounds_;
   int scroll_clip_layer_id_;
 
   gfx::Vector2dF offset_to_transform_parent_;
   uint32_t main_thread_scrolling_reasons_;
-  bool have_scroll_event_handlers_ : 1;
 
   bool user_scrollable_horizontal_ : 1;
   bool user_scrollable_vertical_ : 1;
   bool stacking_order_changed_ : 1;
   // Whether the "back" of this layer should draw.
   bool double_sided_ : 1;
   bool should_flatten_transform_ : 1;
   bool should_flatten_transform_from_property_tree_ : 1;
 
   // Tracks if drawing-related properties have changed since last redraw.
@@ skipping 103 matching lines @@
   // If true, the layer or one of its descendants has a touch handler.
   bool layer_or_descendant_has_touch_handler_;
   bool sorted_for_recursion_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_