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

cc/resources/gpu_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_GPU_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_GPU_RASTER_WORKER_POOL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "cc/resources/raster_worker_pool.h"
 #include "cc/resources/rasterizer.h"
@@ skipping 16 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 RasterCanvas* AcquireCanvasForRaster(RasterTask* task) OVERRIDE;
   virtual void ReleaseCanvasForRaster(RasterTask* task) OVERRIDE;
 
  private:
   GpuRasterWorkerPool(base::SequencedTaskRunner* task_runner,
                       ContextProvider* context_provider,
                       ResourceProvider* resource_provider);
 
   void OnRasterFinished();
   void OnRasterRequiredForActivationFinished();
   void ScheduleRunTasksOnOriginThread();
@@ skipping 23 matching lines @@
   Task::Vector completed_tasks_;
 
   base::WeakPtrFactory<GpuRasterWorkerPool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_GPU_RASTER_WORKER_POOL_H_