cc: Refactor WorkerPoolTaskClient::AcquireBufferForRaster

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 "cc/resources/raster_worker_pool.h"
 
 namespace cc {
 
 class CC_EXPORT ImageRasterWorkerPool : public RasterWorkerPool {
  public:
   virtual ~ImageRasterWorkerPool();
 
   static scoped_ptr<RasterWorkerPool> Create(
       ResourceProvider* resource_provider,
       ContextProvider* context_provider,
       unsigned texture_target);
 
   // Overridden from RasterWorkerPool:
   virtual void ScheduleTasks(RasterTask::Queue* queue) OVERRIDE;
   virtual unsigned GetResourceTarget() const OVERRIDE;
   virtual ResourceFormat GetResourceFormat() const OVERRIDE;
   virtual void CheckForCompletedTasks() OVERRIDE;
 
   // Overridden from internal::WorkerPoolTaskClient:
-  virtual void* AcquireBufferForRaster(internal::RasterWorkerPoolTask* task,
-                                       int* stride) OVERRIDE;
+  virtual SkCanvas* AcquireCanvasForRaster(internal::RasterWorkerPoolTask* task)
+      OVERRIDE;
   virtual void OnRasterCompleted(internal::RasterWorkerPoolTask* task,
                                  const PicturePileImpl::Analysis& analysis)
       OVERRIDE;
   virtual void OnImageDecodeCompleted(internal::WorkerPoolTask* task) OVERRIDE;
 
  protected:
   ImageRasterWorkerPool(internal::TaskGraphRunner* task_graph_runner,
                         ResourceProvider* resource_provider,
                         ContextProvider* context_provider,
                         unsigned texture_target);
@@ skipping 14 matching lines @@
   // completed tasks.
   internal::TaskGraph graph_;
   internal::Task::Vector completed_tasks_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_