Introduce Property Trees

cc/layers/layer.h

 // Copyright 2010 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_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 451 matching lines @@
   virtual bool NeedsVisibleRectUpdated() const;
 
   virtual void RunMicroBenchmark(MicroBenchmark* benchmark);
 
   void Set3dSortingContextId(int id);
   int sorting_context_id() const { return sorting_context_id_; }
 
   // The tree index is slightly counter-intuitive. If |this| is in the transform
   // tree, then the index corresponds to this layer's spot in the tree.
   // Otherwise, the it is the index of our transform parent.
-  void set_transform_tree_index(size_t index) { transform_tree_index_ = index; }
-  void set_opacity_tree_index(size_t index) { opacity_tree_index_ = index; }
-  void set_clip_tree_index(size_t index) { clip_tree_index_ = index; }
+  void set_transform_tree_index(int index) { transform_tree_index_ = index; }
+  void set_opacity_tree_index(int index) { opacity_tree_index_ = index; }
+  void set_clip_tree_index(int index) { clip_tree_index_ = index; }
   int clip_tree_index() const { return clip_tree_index_; }
   int transform_tree_index() const { return transform_tree_index_; }
   int opacity_tree_index() const { return opacity_tree_index_; }
 
   void set_offset_to_transform_parent(gfx::Vector2dF offset) {
     offset_to_transform_parent_ = offset;
   }
   gfx::Vector2dF offset_to_transform_parent() const {
     return offset_to_transform_parent_;
   }
 
+  // TODO(vollick): Nuke.
   void set_fixed_position_container(Layer* layer) {
     fixed_position_container_ = layer;
   }
   Layer* fixed_position_container() const { return fixed_position_container_; }
 
   const gfx::Rect& hack_visible_rect() const { return hack_visible_rect_; }
 
   void set_hack_visible_rect(const gfx::Rect& rect) {
     hack_visible_rect_ = rect;
   }
@@ skipping 182 matching lines @@
 
   PaintProperties paint_properties_;
 
   gfx::Rect hack_visible_rect_;
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_