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

cc/tile_manager.h

Index: cc/tile_manager.h
diff --git a/cc/tile_manager.h b/cc/tile_manager.h
index 4a02dede82ae2c7e87a06bc0899e2af748db9bdb..403bc4e4a3feb633d0c5ca5c8c59b7ee940ea50e 100644
--- a/cc/tile_manager.h
+++ b/cc/tile_manager.h
@@ -10,6 +10,7 @@
 #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 {
@@ -62,6 +63,25 @@ class CC_EXPORT ManagedTileState {
   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
@@ -77,6 +97,7 @@ class CC_EXPORT TileManager {
   void SetGlobalState(const GlobalStateThatImpactsTilePriority& state);
 
   void ManageTiles();
+  void PrepareToDraw();
 
   void renderingStats(RenderingStats* stats);
 
@@ -98,6 +119,7 @@ class CC_EXPORT TileManager {
       scoped_ptr<ResourcePool::Resource>,
       scoped_refptr<PicturePileImpl>,
       RenderingStats*);
+  void CheckForPendingSetPixelsCompletion();
   void DidFinishTileInitialization(Tile*, scoped_ptr<ResourcePool::Resource>);
 
   TileManagerClient* client_;
@@ -106,6 +128,7 @@ class CC_EXPORT TileManager {
   int pending_raster_tasks_;
   size_t num_raster_threads_;
   scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+  bool in_prepare_to_draw_;
 
   GlobalStateThatImpactsTilePriority global_state_;
 
@@ -113,7 +136,12 @@ class CC_EXPORT TileManager {
   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