cc: Move Layer Id to Node Map to Individual Property Tree Private

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 521 matching lines @@
   int clip_tree_index_;
   int scroll_tree_index_;
 
  protected:
   friend class TreeSynchronizer;
 
   DrawMode current_draw_mode_;
 
  private:
   PropertyTrees* GetPropertyTrees() const;
+  ClipTree& GetClipTree() const;
   EffectTree& GetEffectTree() const;
   ScrollTree& GetScrollTree() const;
   TransformTree& GetTransformTree() const;
 
   ElementId element_id_;
   uint32_t mutable_properties_;
   // Rect indicating what was repainted/updated during update.
   // Note that plugin layers bypass this and leave it empty.
   // This is in the layer's space.
   gfx::Rect update_rect_;
@@ skipping 16 matching lines @@
   bool has_will_change_transform_hint_ : 1;
   bool needs_push_properties_ : 1;
   bool scrollbars_hidden_ : 1;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_