cc: Clean up helper function from layer tree host common

cc/trees/damage_tracker.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_DAMAGE_TRACKER_H_
 #define CC_TREES_DAMAGE_TRACKER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 21 matching lines @@
  public:
   static std::unique_ptr<DamageTracker> Create();
   ~DamageTracker();
 
   void DidDrawDamagedArea() { current_damage_rect_ = gfx::Rect(); }
   void AddDamageNextUpdate(const gfx::Rect& dmg) {
     current_damage_rect_.Union(dmg);
   }
   void UpdateDamageTrackingState(
       const LayerImplList& layer_list,
-      int target_surface_layer_id,
+      const RenderSurfaceImpl* target_surface,
       bool target_surface_property_changed_only_from_descendant,
       const gfx::Rect& target_surface_content_rect,
       LayerImpl* target_surface_mask_layer,
       const FilterOperations& filters);
 
   gfx::Rect current_damage_rect() { return current_damage_rect_; }
 
  private:
   DamageTracker();
 
-  gfx::Rect TrackDamageFromActiveLayers(const LayerImplList& layer_list,
-                                        int target_surface_layer_id);
+  gfx::Rect TrackDamageFromActiveLayers(
+      const LayerImplList& layer_list,
+      const RenderSurfaceImpl* target_surface);
   gfx::Rect TrackDamageFromSurfaceMask(LayerImpl* target_surface_mask_layer);
   gfx::Rect TrackDamageFromLeftoverRects();
 
   void PrepareRectHistoryForUpdate();
 
   // These helper functions are used only in TrackDamageFromActiveLayers().
   void ExtendDamageForLayer(LayerImpl* layer, gfx::Rect* target_damage_rect);
   void ExtendDamageForRenderSurface(LayerImpl* layer,
                                     gfx::Rect* target_damage_rect);
 
@@ skipping 21 matching lines @@
 
   unsigned int mailboxId_;
   gfx::Rect current_damage_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(DamageTracker);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_DAMAGE_TRACKER_H_