cc: Do bitmap conversion for RasterBuffer in the worker thread.

cc/resources/image_raster_worker_pool.h

 // Copyright 2013 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_IMAGE_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "cc/resources/raster_worker_pool.h"
@@ skipping 22 matching lines @@
   // Overridden from RasterWorkerPool:
   virtual Rasterizer* AsRasterizer() OVERRIDE;
 
   // Overridden from Rasterizer:
   virtual void SetClient(RasterizerClient* client) OVERRIDE;
   virtual void Shutdown() OVERRIDE;
   virtual void ScheduleTasks(RasterTaskQueue* queue) OVERRIDE;
   virtual void CheckForCompletedTasks() OVERRIDE;
 
   // Overridden from RasterizerTaskClient:
-  virtual SkCanvas* AcquireCanvasForRaster(RasterTask* task) OVERRIDE;
-  virtual void ReleaseCanvasForRaster(RasterTask* task) OVERRIDE;
+  virtual RasterBuffer* AcquireBufferForRaster(RasterTask* task) OVERRIDE;
+  virtual void ReleaseBufferForRaster(RasterTask* task) OVERRIDE;
 
  protected:
   ImageRasterWorkerPool(base::SequencedTaskRunner* task_runner,
                         TaskGraphRunner* task_graph_runner,
                         ResourceProvider* resource_provider);
 
  private:
   void OnRasterFinished();
   void OnRasterRequiredForActivationFinished();
   scoped_refptr<base::debug::ConvertableToTraceFormat> StateAsValue() const;
@@ skipping 16 matching lines @@
   Task::Vector completed_tasks_;
 
   base::WeakPtrFactory<ImageRasterWorkerPool> raster_finished_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_