[cc] Track the rendering & painting cost of impl-side painting.

cc/tile_manager.h

Index: cc/tile_manager.h
diff --git a/cc/tile_manager.h b/cc/tile_manager.h
index fd13d86a3eb7d4be84a8481241b75d3d6f984f6d..2d57f7d04312d5607630b68a75f7b5845c921e5b 100644
--- a/cc/tile_manager.h
+++ b/cc/tile_manager.h
@@ -20,6 +20,7 @@ namespace cc {
 
 class Tile;
 class TileVersion;
+struct RenderingStats;
 class ResourceProvider;
 
 class CC_EXPORT TileManagerClient {
@@ -75,6 +76,8 @@ class CC_EXPORT TileManager {
 
   void ManageTiles();
 
+  void renderingStats(RenderingStats* stats);
+
  protected:
   // Methods called by Tile
   friend class Tile;
@@ -91,7 +94,8 @@ class CC_EXPORT TileManager {
   void OnRasterTaskCompleted(
       scoped_refptr<Tile>,
       ResourceProvider::ResourceId,
-      scoped_refptr<PicturePileImpl>);
+      scoped_refptr<PicturePileImpl>,
+      RenderingStats*);
   void DidFinishTileInitialization(Tile*, ResourceProvider::ResourceId);
 
   TileManagerClient* client_;
@@ -105,6 +109,8 @@ class CC_EXPORT TileManager {
   typedef std::vector<Tile*> TileVector;
   TileVector tiles_;
   TileVector tiles_that_need_to_be_rasterized_;
+
+  RenderingStats rendering_stats_;
 };
 
 }  // namespace cc