cc : Add LayerToPropertyTreeIndices map to PropertyTrees

cc/trees/property_tree.h

 // Copyright 2014 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_PROPERTY_TREE_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 647 matching lines @@
   PropertyTrees();
   PropertyTrees(const PropertyTrees& other);
   ~PropertyTrees();
 
   bool operator==(const PropertyTrees& other) const;
   PropertyTrees& operator=(const PropertyTrees& from);
 
   void ToProtobuf(proto::PropertyTrees* proto) const;
   void FromProtobuf(const proto::PropertyTrees& proto);
 
+  std::unordered_map<int, int> transform_node_owner_to_node_map;
+  std::unordered_map<int, int> effect_node_owner_to_node_map;
+  std::unordered_map<int, int> clip_node_owner_to_node_map;
+  std::unordered_map<int, int> scroll_node_owner_to_node_map;

[ajuma, 2016/05/13 14:38:53]

Nit: how about using names like "transform_id_to_index_map" so they continue to
make sense for trees built by Blink (where nodes won't have an 'owner')?

[jaydasika, 2016/05/13 19:40:39]

Done.

   TransformTree transform_tree;
   EffectTree effect_tree;
   ClipTree clip_tree;
   ScrollTree scroll_tree;
   bool needs_rebuild;
   bool non_root_surfaces_enabled;
   // Change tracking done on property trees needs to be preserved across commits
   // (when they are not rebuild). We cache a global bool which stores whether
   // we did any change tracking so that we can skip copying the change status
   // between property trees when this bool is false.
@@ skipping 32 matching lines @@
 
  private:
   gfx::Vector2dF inner_viewport_container_bounds_delta_;
   gfx::Vector2dF outer_viewport_container_bounds_delta_;
   gfx::Vector2dF inner_viewport_scroll_bounds_delta_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_