cc: Do bitmap conversion for RasterBuffer in the worker thread.

cc/resources/gpu_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/gpu_raster_worker_pool.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/output/context_provider.h"
 #include "cc/resources/resource.h"
 #include "cc/resources/resource_provider.h"
@@ skipping 130 matching lines @@
 
     task->WillComplete();
     task->CompleteOnOriginThread(this);
     task->DidComplete();
 
     task->RunReplyOnOriginThread();
   }
   completed_tasks_.clear();
 }
 
-SkCanvas* GpuRasterWorkerPool::AcquireCanvasForRaster(RasterTask* task) {
-  return resource_provider_->MapGpuRasterBuffer(task->resource()->id());
+RasterBuffer* GpuRasterWorkerPool::AcquireBufferForRaster(RasterTask* task) {
+  return resource_provider_->AcquireGpuRasterBuffer(task->resource()->id());
 }
 
-void GpuRasterWorkerPool::ReleaseCanvasForRaster(RasterTask* task) {
-  resource_provider_->UnmapGpuRasterBuffer(task->resource()->id());
+void GpuRasterWorkerPool::ReleaseBufferForRaster(RasterTask* task) {
+  resource_provider_->ReleaseGpuRasterBuffer(task->resource()->id());
 }
 
 void GpuRasterWorkerPool::OnRasterFinished() {
   TRACE_EVENT0("cc", "GpuRasterWorkerPool::OnRasterFinished");
 
   DCHECK(raster_tasks_pending_);
   raster_tasks_pending_ = false;
   client_->DidFinishRunningTasks();
 }
 
@@ skipping 21 matching lines @@
   TRACE_EVENT0("cc", "GpuRasterWorkerPool::RunTasksOnOriginThread");
 
   DCHECK(run_tasks_on_origin_thread_pending_);
   run_tasks_on_origin_thread_pending_ = false;
 
   ScopedGpuRaster gpu_raster(context_provider_);
   task_graph_runner_->RunUntilIdle();
 }
 
 }  // namespace cc