cc: Refactor WorkerPoolTaskClient::AcquireBufferForRaster

cc/resources/pixel_buffer_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_PIXEL_BUFFER_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_PIXEL_BUFFER_RASTER_WORKER_POOL_H_
 
 #include <deque>
 
 #include "base/containers/hash_tables.h"
@@ skipping 22 matching lines @@
       size_t max_transfer_buffer_usage_bytes);
 
   // Overridden from RasterWorkerPool:
   virtual void Shutdown() OVERRIDE;
   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:
   PixelBufferRasterWorkerPool(internal::TaskGraphRunner* task_graph_runner,
                               ResourceProvider* resource_provider,
                               ContextProvider* context_provider,
                               size_t max_transfer_buffer_usage_bytes);
@@ skipping 54 matching lines @@
   internal::Task::Vector completed_tasks_;
 
   base::WeakPtrFactory<PixelBufferRasterWorkerPool> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PixelBufferRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PIXEL_BUFFER_RASTER_WORKER_POOL_H_