cc: Parameterize the main thread task runner

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 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.
 
 #include "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 507 matching lines @@
   RenderThreadImpl* render_thread = RenderThreadImpl::current();
   cc::SharedBitmapManager* shared_bitmap_manager = NULL;
   // render_thread may be NULL in tests.
   if (render_thread) {
     compositor_message_loop_proxy =
         render_thread->compositor_message_loop_proxy();
     shared_bitmap_manager = render_thread->shared_bitmap_manager();
   }
   if (compositor_message_loop_proxy.get()) {
     layer_tree_host_ = cc::LayerTreeHost::CreateThreaded(
-        this, shared_bitmap_manager, settings, compositor_message_loop_proxy);
+        this,
+        shared_bitmap_manager,
+        settings,
+        base::MessageLoopProxy::current(),
+        compositor_message_loop_proxy);
   } else {
     layer_tree_host_ = cc::LayerTreeHost::CreateSingleThreaded(
-        this, this, shared_bitmap_manager, settings);
+        this,
+        this,
+        shared_bitmap_manager,
+        settings,
+        base::MessageLoopProxy::current());
   }
   DCHECK(layer_tree_host_);
 }
 
 void RenderWidgetCompositor::setSurfaceReady() {
   layer_tree_host_->SetLayerTreeHostClientReady();
 }
 
 void RenderWidgetCompositor::setRootLayer(const blink::WebLayer& layer) {
   layer_tree_host_->SetRootLayer(
@@ skipping 260 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content