cc: Single-threaded impl-side painting for unit tests

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 1947 matching lines @@
   if (pending_tree_)
     pending_tree_->set_needs_update_draw_properties();
   client_->UpdateRendererCapabilitiesOnImplThread();
 }
 
 void LayerTreeHostImpl::CreateAndSetTileManager() {
   DCHECK(!tile_manager_);
   DCHECK(settings_.impl_side_painting);
   DCHECK(output_surface_);
   DCHECK(resource_provider_);
-  DCHECK(proxy_->ImplThreadTaskRunner());
+  base::SingleThreadTaskRunner* task_runner =
+      proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
+                              : proxy_->MainThreadTaskRunner();
+  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(),
                                        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(proxy_->ImplThreadTaskRunner(),
-                                    context_provider,
-                                    resource_provider_.get());
+    raster_worker_pool_ = GpuRasterWorkerPool::Create(
+        task_runner, context_provider, resource_provider_.get());
   } 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(),
                                          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(),
                              GL_TEXTURE_2D,
                              resource_provider_->best_texture_format());
 
     raster_worker_pool_ =
-        OneCopyRasterWorkerPool::Create(proxy_->ImplThreadTaskRunner(),
+        OneCopyRasterWorkerPool::Create(task_runner,
                                         RasterWorkerPool::GetTaskGraphRunner(),
                                         context_provider,
                                         resource_provider_.get(),
                                         staging_resource_pool_.get());
   } else {
     resource_pool_ = ResourcePool::Create(
         resource_provider_.get(),
         GL_TEXTURE_2D,
         resource_provider_->memory_efficient_texture_format());
 
     raster_worker_pool_ = PixelBufferRasterWorkerPool::Create(
-        proxy_->ImplThreadTaskRunner(),
+        task_runner,
         RasterWorkerPool::GetTaskGraphRunner(),
         context_provider,
         resource_provider_.get(),
         GetMaxTransferBufferUsageBytes(context_provider->ContextCapabilities(),
                                        settings_.refresh_rate));
   }
 
-  tile_manager_ =
-      TileManager::Create(this,
-                          proxy_->ImplThreadTaskRunner(),
-                          resource_pool_.get(),
-                          raster_worker_pool_->AsRasterizer(),
-                          rendering_stats_instrumentation_);
+  tile_manager_ = TileManager::Create(this,
+                                      task_runner,
+                                      resource_pool_.get(),
+                                      raster_worker_pool_->AsRasterizer(),
+                                      rendering_stats_instrumentation_);
 
   UpdateTileManagerMemoryPolicy(ActualManagedMemoryPolicy());
   need_to_update_visible_tiles_before_draw_ = false;
 }
 
 void LayerTreeHostImpl::DestroyTileManager() {
   tile_manager_ = nullptr;
   resource_pool_ = nullptr;
   staging_resource_pool_ = nullptr;
   raster_worker_pool_ = nullptr;
@@ skipping 1356 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