Support single-threaded impl-side painting

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 2001 matching lines @@
   DCHECK(task_runner);
 
   ContextProvider* context_provider = output_surface_->context_provider();
   if (!context_provider) {
     resource_pool_ =
         ResourcePool::Create(resource_provider_.get(),
                              GL_TEXTURE_2D,
                              resource_provider_->best_texture_format());
 
     raster_worker_pool_ =
-        BitmapRasterWorkerPool::Create(proxy_->ImplThreadTaskRunner(),
+        BitmapRasterWorkerPool::Create(task_runner,
                                        RasterWorkerPool::GetTaskGraphRunner(),
                                        resource_provider_.get());
   } else if (use_gpu_rasterization_) {
     resource_pool_ =
         ResourcePool::Create(resource_provider_.get(),
                              GL_TEXTURE_2D,
                              resource_provider_->best_texture_format());
 
     raster_worker_pool_ =
         GpuRasterWorkerPool::Create(task_runner,
                                     context_provider,
                                     resource_provider_.get(),
                                     settings_.use_distance_field_text);
   } else if (UseZeroCopyRasterizer()) {
     resource_pool_ = ResourcePool::Create(
         resource_provider_.get(),
         GetMapImageTextureTarget(context_provider->ContextCapabilities()),
         resource_provider_->best_texture_format());
 
     raster_worker_pool_ =
-        ZeroCopyRasterWorkerPool::Create(proxy_->ImplThreadTaskRunner(),
+        ZeroCopyRasterWorkerPool::Create(task_runner,
                                          RasterWorkerPool::GetTaskGraphRunner(),
                                          resource_provider_.get());
   } else if (UseOneCopyRasterizer()) {
     // We need to create a staging resource pool when using copy rasterizer.
     staging_resource_pool_ = ResourcePool::Create(
         resource_provider_.get(),
         GetMapImageTextureTarget(context_provider->ContextCapabilities()),
         resource_provider_->best_texture_format());
     resource_pool_ =
         ResourcePool::Create(resource_provider_.get(),
@@ skipping 1423 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc