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..7c5352f90d84e6f94a114977ed3dd749ef459218 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>:
@@ -288,6 +292,8 @@ class CC_EXPORT TileManager : public RasterizerClient,
   bool IsReadyToActivate() const;
   void CheckIfReadyToActivate();
 
+  static bool TileHasRasterTask(const Tile* tile);
+
   TileManagerClient* client_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   ResourcePool* resource_pool_;
@@ -331,8 +337,6 @@ class CC_EXPORT TileManager : public RasterizerClient,
   // Queue used when scheduling raster tasks.
   RasterTaskQueue raster_queue_;
 
-  std::vector<scoped_refptr<RasterTask> > orphan_raster_tasks_;
-
   UniqueNotifier ready_to_activate_check_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);