cc: Partial tile update for one-copy raster.

cc/raster/pixel_buffer_tile_task_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_RASTER_PIXEL_BUFFER_TILE_TASK_WORKER_POOL_H_
 #define CC_RASTER_PIXEL_BUFFER_TILE_TASK_WORKER_POOL_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 32 matching lines @@
 
   // Overridden from TileTaskRunner:
   void SetClient(TileTaskRunnerClient* client) override;
   void Shutdown() override;
   void ScheduleTasks(TileTaskQueue* queue) override;
   void CheckForCompletedTasks() override;
   ResourceFormat GetResourceFormat() override;
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
-      const Resource* resource) override;
+      const Resource* resource,
+      uint64_t new_content_id,
+      uint64_t previous_content_id) override;
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
  private:
   struct RasterTaskState {
     class TaskComparator {
      public:
       explicit TaskComparator(const RasterTask* task) : task_(task) {}
 
       bool operator()(const RasterTaskState& state) const {
         return state.task == task_;
@@ skipping 70 matching lines @@
 
   base::WeakPtrFactory<PixelBufferTileTaskWorkerPool>
       task_set_finished_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PixelBufferTileTaskWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_PIXEL_BUFFER_TILE_TASK_WORKER_POOL_H_