Hit test on the layer tree rather than the RSLL

cc/trees/layer_tree_impl.h

 // Copyright 2012 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_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 230 matching lines @@
   bool IsUIResourceOpaque(UIResourceId uid) const;
 
   void AddLayerWithCopyOutputRequest(LayerImpl* layer);
   void RemoveLayerWithCopyOutputRequest(LayerImpl* layer);
   const std::vector<LayerImpl*>& LayersWithCopyOutputRequest() const;
 
   int current_render_surface_list_id() const {
     return render_surface_layer_list_id_;
   }
 
+  LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
+      const gfx::PointF& screen_space_point);
+
+  LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
+
+  LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
+      const gfx::PointF& screen_space_point);
+
+  void set_current_render_surface_list_id_for_testing(int id) {
+    render_surface_layer_list_id_ = id;
+  }
+
  protected:
   explicit LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl);
 
   LayerTreeHostImpl* layer_tree_host_impl_;
   int source_frame_number_;
   scoped_ptr<LayerImpl> root_layer_;
   HeadsUpDisplayLayerImpl* hud_layer_;
   LayerImpl* currently_scrolling_layer_;
   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
   scoped_ptr<LayerScrollOffsetDelegateProxy>
@@ skipping 42 matching lines @@
 
   int render_surface_layer_list_id_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_