cc: Do not cleanup tiles with raster tasks.

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 5ad80910f8e8aed434edc19e2a04571ce3d62781..df5773c0423214cb12ecbb6935c649fabd0232a7 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -227,7 +227,10 @@ class CC_EXPORT TileManager : public RasterizerClient,
 
   void SetRasterizerForTesting(Rasterizer* rasterizer);
 
-  void CleanUpReleasedTilesForTesting() { CleanUpReleasedTiles(); }
+  void FreeResourcesAndCleanUpReleasedTilesForTesting() {
+    FreeResourcesForReleasedTiles();
+    CleanUpReleasedTiles();
+  }
 
  protected:
   TileManager(TileManagerClient* client,
@@ -240,6 +243,7 @@ class CC_EXPORT TileManager : public RasterizerClient,
   friend class Tile;
   void DidChangeTilePriority(Tile* tile);
 
+  void FreeResourcesForReleasedTiles();
   void CleanUpReleasedTiles();
 
   // Overriden from RefCountedManager<Tile>: