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

cc/resources/image_copy_raster_worker_pool.h

 // Copyright 2014 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_COPY_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 30 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:
   ImageCopyRasterWorkerPool(base::SequencedTaskRunner* task_runner,
                             TaskGraphRunner* task_graph_runner,
                             ContextProvider* context_provider,
                             ResourceProvider* resource_provider,
                             ResourcePool* resource_pool);
 
  private:
   struct RasterTaskState {
@@ skipping 49 matching lines @@
 
   base::WeakPtrFactory<ImageCopyRasterWorkerPool>
       raster_finished_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageCopyRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_