cc: Put to_target and to_screen behind an accessor.

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 487 matching lines @@
 
   const std::vector<int>& nodes_affected_by_inner_viewport_bounds_delta()
       const {
     return nodes_affected_by_inner_viewport_bounds_delta_;
   }
   const std::vector<int>& nodes_affected_by_outer_viewport_bounds_delta()
       const {
     return nodes_affected_by_outer_viewport_bounds_delta_;
   }
 
+  gfx::Transform ToTarget(int id) const;

[ajuma, 2016/06/03 19:35:29]

const gfx::Transform&

+  void SetToTarget(int id, const gfx::Transform& transform);
+  gfx::Transform ToScreen(int id) const;

[ajuma, 2016/06/03 19:35:29]

const gfx::Transform&

+  void SetToScreen(int id, const gfx::Transform& transform);
+  int TargetId(int id) const;

[ajuma, 2016/06/03 19:35:29]

Nit: here and below, s/id/node_id (so it's clearer we mean the node id and not
the target id).

+  void SetTargetId(int id, int target_id);
+  int ContentTargetId(int id) const;
+  void SetContentTargetId(int id, int content_target_id);
+
   gfx::Transform ToScreenSpaceTransformWithoutSublayerScale(int id) const;
 
   void ToProtobuf(proto::PropertyTree* proto) const;
   void FromProtobuf(const proto::PropertyTree& proto,
                     std::unordered_map<int, int>* node_id_to_index_map);
 
  private:
   // Returns true iff the node at |desc_id| is a descendant of the node at
   // |anc_id|.
   bool IsDescendant(int desc_id, int anc_id) const;
@@ skipping 221 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_