HACK: Rasterize tiles immediately if there are only a few of them

cc/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_TILE_MANAGER_H_
 #define CC_TILE_MANAGER_H_
 
 #include <list>
 #include <queue>
 #include <vector>
@@ skipping 114 matching lines @@
   void FreeResourcesForTile(Tile* tile);
   void ScheduleManageTiles();
   void DispatchMoreTasks();
   void GatherPixelRefsForTile(Tile* tile);
   void DispatchImageDecodeTasksForTile(Tile* tile);
   void DispatchOneImageDecodeTask(
       scoped_refptr<Tile> tile, skia::LazyPixelRef* pixel_ref);
   void OnImageDecodeTaskCompleted(
       scoped_refptr<Tile> tile, uint32_t pixel_ref_id);
   bool CanDispatchRasterTask(Tile* tile);
-  void DispatchOneRasterTask(scoped_refptr<Tile> tile);
+  void DispatchOneRasterTask(scoped_refptr<Tile> tile, bool immediate);
   void OnRasterTaskCompleted(
       scoped_refptr<Tile> tile,
       scoped_ptr<ResourcePool::Resource> resource,
-      int manage_tiles_call_count_when_dispatched);
+      int manage_tiles_call_count_when_dispatched,
+      bool dispatch_more);
   void DidFinishTileInitialization(Tile* tile);
   void DidTileRasterStateChange(Tile* tile, TileRasterState state);
   void DidTileBinChange(Tile* tile,
                         TileManagerBin bin,
                         WhichTree tree);
   scoped_ptr<Value> GetMemoryRequirementsAsValue() const;
 
   static void RunRasterTask(uint8* buffer,
                             const gfx::Rect& rect,
                             float contents_scale,
@@ skipping 30 matching lines @@
   RenderingStats rendering_stats_;
 
   int raster_state_count_[NUM_STATES][NUM_TREES][NUM_BINS];
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILE_MANAGER_H_