cc: Impl thread scroll on ScrollNode instead of LayerImpl

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 423 matching lines @@
 
   // Returns the delta of the scroll that was outside of the bounds of the
   // initial scroll
   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 
   void SetScrollClipLayer(int scroll_clip_layer_id);
   int scroll_clip_layer_id() const { return scroll_clip_layer_id_; }
   LayerImpl* scroll_clip_layer() const;
   bool scrollable() const;
 
-  void set_user_scrollable_horizontal(bool scrollable) {
-    user_scrollable_horizontal_ = scrollable;
-  }
+  void set_user_scrollable_horizontal(bool scrollable);
   bool user_scrollable_horizontal() const {
     return user_scrollable_horizontal_;
   }
-  void set_user_scrollable_vertical(bool scrollable) {
-    user_scrollable_vertical_ = scrollable;
-  }
+  void set_user_scrollable_vertical(bool scrollable);
   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 
   bool user_scrollable(ScrollbarOrientation orientation) const;
 
   void set_main_thread_scrolling_reasons(
       uint32_t main_thread_scrolling_reasons);
   uint32_t main_thread_scrolling_reasons() const {
     return main_thread_scrolling_reasons_;
   }
   bool should_scroll_on_main_thread() const {
@@ skipping 322 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_