Support single-threaded impl-side painting

cc/resources/one_copy_raster_worker_pool.cc

 // 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.
 
 #include "cc/resources/one_copy_raster_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_argument.h"
@@ skipping 199 matching lines @@
     task->CompleteOnOriginThread(this);
     task->DidComplete();
 
     task->RunReplyOnOriginThread();
   }
   completed_tasks_.clear();
 
   context_provider_->ContextGL()->ShallowFlushCHROMIUM();
 }
 
+void OneCopyRasterWorkerPool::WaitForTasksToFinishRunning() {
+  task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
+}
+
 scoped_ptr<RasterBuffer> OneCopyRasterWorkerPool::AcquireBufferForRaster(
     const Resource* resource) {
   DCHECK_EQ(resource->format(), resource_pool_->resource_format());
   return make_scoped_ptr<RasterBuffer>(
       new RasterBufferImpl(resource_provider_, resource_pool_, resource));
 }
 
 void OneCopyRasterWorkerPool::ReleaseBufferForRaster(
     scoped_ptr<RasterBuffer> buffer) {
   // Nothing to do here. RasterBufferImpl destructor cleans up after itself.
@@ skipping 37 matching lines @@
                             resource_pool_->total_memory_usage_bytes());
   staging_state->SetInteger("pending_copy_count",
                             resource_pool_->total_resource_count() -
                                 resource_pool_->acquired_resource_count());
   staging_state->SetInteger("bytes_pending_copy",
                             resource_pool_->total_memory_usage_bytes() -
                                 resource_pool_->acquired_memory_usage_bytes());
 }
 
 }  // namespace cc