cc: Use asynchronous set pixels API for impl-side painting.

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 <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "cc/resource_pool.h"
+#include "cc/scoped_ptr_deque.h"
 #include "cc/tile_priority.h"
 
 namespace base {
 class SequencedWorkerPool;
 }
 
 namespace cc {
 
 class Tile;
 class TileVersion;
@@ skipping 32 matching lines @@
   scoped_ptr<ResourcePool::Resource> resource;
   bool resource_is_being_initialized;
   bool contents_swizzled;
 
   // Ephemeral state, valid only during Manage.
   TileManagerBin bin;
   TileResolution resolution;
   float time_to_needed_in_seconds;
 };
 
+class PendingSetPixels {
+ public:
+  PendingSetPixels(Tile*, scoped_ptr<ResourcePool::Resource>);
+  ~PendingSetPixels();
+
+  Tile* tile() { return tile_.get(); }
+  ResourcePool::Resource* resource() { return resource_.get(); }
+  scoped_ptr<ResourcePool::Resource> takeResource() {
+    return resource_.Pass();
+  }
+
+ private:
+  scoped_refptr<Tile> tile_;
+  scoped_ptr<ResourcePool::Resource> resource_;
+
+  DISALLOW_COPY_AND_ASSIGN(PendingSetPixels);
+};
+
+
 // 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 PrepareToDraw();
 
   void renderingStats(RenderingStats* stats);
 
  protected:
   // Methods called by Tile
   friend class Tile;
   void RegisterTile(Tile*);
   void UnregisterTile(Tile*);
   void WillModifyTilePriority(Tile*, WhichTree, const TilePriority& new_priority);
 
  private:
   void AssignGpuMemoryToTiles();
   void FreeResourcesForTile(Tile*);
   void ScheduleManageTiles();
   void DispatchMoreRasterTasks();
   void DispatchOneRasterTask(scoped_refptr<Tile>);
   void OnRasterTaskCompleted(
       scoped_refptr<Tile>,
       scoped_ptr<ResourcePool::Resource>,
       scoped_refptr<PicturePileImpl>,
       RenderingStats*);
+  void CheckForPendingSetPixelsCompletion();
   void DidFinishTileInitialization(Tile*, scoped_ptr<ResourcePool::Resource>);
 
   TileManagerClient* client_;
   scoped_ptr<ResourcePool> resource_pool_;
   bool manage_tiles_pending_;
   int pending_raster_tasks_;
   size_t num_raster_threads_;
   scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+  bool in_prepare_to_draw_;
 
   GlobalStateThatImpactsTilePriority global_state_;
 
   typedef std::vector<Tile*> TileVector;
   TileVector tiles_;
   TileVector tiles_that_need_to_be_rasterized_;
 
+  typedef ScopedPtrDeque<PendingSetPixels> PendingSetPixelsDeque;
+  PendingSetPixelsDeque pending_set_pixels_;
+
   RenderingStats rendering_stats_;
+
+  DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILE_MANAGER_H_