cc: Add TileManager interface that allows LTHI to determine when to activate pending tree.

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 41 matching lines @@
   // Persisted state: valid all the time.
   bool can_use_gpu_memory;
   bool can_be_freed;
   scoped_ptr<ResourcePool::Resource> resource;
   bool resource_is_being_initialized;
   bool contents_swizzled;
   bool need_to_gather_pixel_refs;
   std::list<skia::LazyPixelRef*> pending_pixel_refs;
 
   // Ephemeral state, valid only during Manage.
-  TileManagerBin bin;
+  TileManagerBin bin[NUM_TREES];
+  // Bin used to determine raster priority.
+  TileManagerBin raster_bin;
   TileResolution resolution;
   float time_to_needed_in_seconds;
 };
 
 // This class manages tiles, deciding which should get rasterized and which
 // should no longer have any memory assigned to them. Tile objects are "owned"
 // by layers; they automatically register with the manager when they are
 // created, and unregister from the manager when they are deleted.
 class CC_EXPORT TileManager {
  public:
   TileManager(TileManagerClient* client,
               ResourceProvider *resource_provider,
               size_t num_raster_threads);
   virtual ~TileManager();
 
   const GlobalStateThatImpactsTilePriority& GlobalState() const { return global_state_; }
   void SetGlobalState(const GlobalStateThatImpactsTilePriority& state);
 
   void ManageTiles();
   void CheckForCompletedSetPixels();
 
-  void renderingStats(RenderingStats* stats);
+  void GetRenderingStats(RenderingStats* stats);
+
+  int GetTilesInBinCount(TileManagerBin bin, WhichTree tree);
+  int GetDrawableTilesInBinCount(TileManagerBin bin, WhichTree tree);
 
  protected:
   // Methods called by Tile
   friend class Tile;
   void RegisterTile(Tile*);
   void UnregisterTile(Tile*);
   void WillModifyTilePriority(Tile*, WhichTree, const TilePriority& new_priority);
 
  private:
+  void ResetBinCounts();
   void AssignGpuMemoryToTiles();
   void FreeResourcesForTile(Tile*);
   void ScheduleManageTiles();
   void ScheduleCheckForCompletedSetPixels();
   void DispatchMoreTasks();
   void DispatchOneRasterTask(RasterThread*, scoped_refptr<Tile>);
   void OnRasterTaskCompleted(
       scoped_refptr<Tile>,
       scoped_ptr<ResourcePool::Resource>,
       scoped_refptr<PicturePileImpl>,
       RenderingStats*);
   void DidFinishTileInitialization(Tile*);
   void DispatchImageDecodingTasksForTile(Tile*);
   void OnImageDecodingTaskCompleted(scoped_refptr<Tile>, uint32_t);
   void DispatchOneImageDecodingTask(
       RasterThread*, scoped_refptr<Tile>, skia::LazyPixelRef*);
   RasterThread* GetFreeRasterThread();
 
   TileManagerClient* client_;
   scoped_ptr<ResourcePool> resource_pool_;
   bool manage_tiles_pending_;
   bool check_for_completed_set_pixels_pending_;
 
   GlobalStateThatImpactsTilePriority global_state_;
 
+  int tiles_in_bin_count_[NUM_BINS][NUM_TREES];
+  int drawable_tiles_in_bin_count_[NUM_BINS][NUM_TREES];
+
   typedef std::vector<Tile*> TileVector;
   TileVector tiles_;
   TileVector tiles_that_need_to_be_rasterized_;
 
   typedef std::list<Tile*> TileList;
   // Tiles with image decoding tasks. These tiles need to be rasterized
   // when all the image decoding tasks finish.
   TileList tiles_with_image_decoding_tasks_;
 
   typedef base::hash_map<uint32_t, skia::LazyPixelRef*> PixelRefMap;
   PixelRefMap pending_decode_tasks_;
 
   typedef std::queue<scoped_refptr<Tile> > TileQueue;
   TileQueue tiles_with_pending_set_pixels_;
 
   typedef ScopedPtrVector<RasterThread> RasterThreadVector;
   RasterThreadVector raster_threads_;
 
   RenderingStats rendering_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILE_MANAGER_H_