Support single-threaded impl-side painting

cc/resources/tile_manager.h

 // Copyright 2012 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_RESOURCES_TILE_MANAGER_H_
 #define CC_RESOURCES_TILE_MANAGER_H_
 
 #include <deque>
 #include <queue>
 #include <set>
@@ skipping 126 matching lines @@
     }
   }
 
   void SetGlobalStateForTesting(
       const GlobalStateThatImpactsTilePriority& state) {
     global_state_ = state;
   }
 
   void SetRasterizerForTesting(Rasterizer* rasterizer);
 
+  void WaitForTasksToFinishRunning();
+
   void FreeResourcesAndCleanUpReleasedTilesForTesting() {
     FreeResourcesForReleasedTiles();
     CleanUpReleasedTiles();
   }
 
   std::vector<Tile*> AllTilesForTesting() const {
     std::vector<Tile*> tiles;
     for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end();
          ++it) {
       tiles.push_back(it->second);
@@ skipping 116 matching lines @@
   RasterTilePriorityQueue raster_priority_queue_;
   EvictionTilePriorityQueue eviction_priority_queue_;
   bool eviction_priority_queue_is_up_to_date_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_