Retry tree activation if raster tasks finish during first half of vsync interval

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 <list>
 #include <queue>
 #include <set>
@@ skipping 12 matching lines @@
 namespace cc {
 class RasterWorkerPool;
 class ResourceProvider;
 class Tile;
 class TileVersion;
 
 class CC_EXPORT TileManagerClient {
  public:
   virtual void ScheduleManageTiles() = 0;
   virtual void DidInitializeVisibleTile() = 0;
+  virtual void DidFinishTileRasterTasks() = 0;
 
  protected:
   virtual ~TileManagerClient() {}
 };
 
 // Tile manager classifying tiles into a few basic
 // bins:
 enum TileManagerBin {
   NOW_BIN = 0,  // Needed ASAP.
   SOON_BIN = 1,  // Impl-side version of prepainting.
@@ skipping 162 matching lines @@
   size_t max_pending_tasks_;
 
   base::TimeTicks anticipated_draw_time_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_