cc: Parameterize the main thread task runner

mojo/examples/compositor_app/compositor_host.cc

 // Copyright 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 "mojo/examples/compositor_app/compositor_host.h"
 
 #include "cc/layers/layer.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface.h"
 #include "cc/trees/layer_tree_host.h"
 #include "mojo/cc/context_provider_mojo.h"
 
 namespace mojo {
 namespace examples {
 
 CompositorHost::CompositorHost(ScopedMessagePipeHandle command_buffer_handle)
     : command_buffer_handle_(command_buffer_handle.Pass()),
       compositor_thread_("compositor") {
   DCHECK(command_buffer_handle_.is_valid());
   bool started = compositor_thread_.Start();
   DCHECK(started);
 
   cc::LayerTreeSettings settings;
   tree_ = cc::LayerTreeHost::CreateThreaded(
-      this, NULL, settings, compositor_thread_.message_loop_proxy());
+      this,
+      NULL,
+      settings,
+      base::MessageLoopProxy::current(),
+      compositor_thread_.message_loop_proxy());
   SetupScene();
 }
 
 CompositorHost::~CompositorHost() {}
 
 void CompositorHost::SetSize(const gfx::Size& viewport_size) {
   tree_->SetViewportSize(viewport_size);
   tree_->SetLayerTreeHostClientReady();
 }
 
@@ skipping 43 matching lines @@
 void CompositorHost::DidInitializeOutputSurface() {
 }
 
 void CompositorHost::WillCommit() {}
 void CompositorHost::DidCommit() {}
 void CompositorHost::DidCommitAndDrawFrame() {}
 void CompositorHost::DidCompleteSwapBuffers() {}
 
 }  // namespace examples
 }  // namespace mojo