Support single-threaded impl-side painting

cc/resources/zero_copy_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_ZERO_COPY_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_ZERO_COPY_RASTER_WORKER_POOL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "cc/resources/raster_worker_pool.h"
@@ skipping 20 matching lines @@
       ResourceProvider* resource_provider);
 
   // Overridden from RasterWorkerPool:
   Rasterizer* AsRasterizer() override;
 
   // Overridden from Rasterizer:
   void SetClient(RasterizerClient* client) override;
   void Shutdown() override;
   void ScheduleTasks(RasterTaskQueue* queue) override;
   void CheckForCompletedTasks() override;
+  void WaitForTasksToFinishRunning() override;
 
   // Overridden from RasterizerTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource) override;
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
  protected:
   ZeroCopyRasterWorkerPool(base::SequencedTaskRunner* task_runner,
                            TaskGraphRunner* task_graph_runner,
                            ResourceProvider* resource_provider);
@@ skipping 19 matching lines @@
 
   base::WeakPtrFactory<ZeroCopyRasterWorkerPool>
       raster_finished_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ZeroCopyRasterWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_ZERO_COPY_RASTER_WORKER_POOL_H_