cc: Change tile manager perftest to use layers.

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index beca880e05dcc1f2a6935c09feff634b9e9ed2ce..8008b330c0b61b2da9982dac50cfbbcd75c0bf54 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -22,6 +22,7 @@
 #include "cc/resources/picture_pile_impl.h"
 #include "cc/resources/prioritized_tile_set.h"
 #include "cc/resources/rasterizer.h"
+#include "cc/resources/rasterizer_delegate.h"
 #include "cc/resources/resource_pool.h"
 #include "cc/resources/tile.h"
 
@@ -224,6 +225,11 @@ class CC_EXPORT TileManager : public RasterizerClient,
     }
   }
 
+  void SetRasterizersForTesting(Rasterizer* rasterizer,
+                                Rasterizer* gpu_rasterizer);
+
+  void CleanUpReleasedTilesForTesting() { CleanUpReleasedTiles(); }
+
  protected:
   TileManager(TileManagerClient* client,
               ResourcePool* resource_pool,