cc: Create ProxyBeginFrameSource

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 421 matching lines @@
   }
 
   if (compositor_thread_task_runner.get()) {
     layer_tree_host_ = cc::LayerTreeHost::CreateThreaded(
         this, shared_bitmap_manager, gpu_memory_buffer_manager, settings,
         main_thread_compositor_task_runner, compositor_thread_task_runner,
         external_begin_frame_source.Pass());
   } else {
     layer_tree_host_ = cc::LayerTreeHost::CreateSingleThreaded(
         this, this, shared_bitmap_manager, gpu_memory_buffer_manager, settings,
-        main_thread_compositor_task_runner, external_begin_frame_source.Pass());
+        main_thread_compositor_task_runner, external_begin_frame_source.Pass(),
+        nullptr);
   }
   DCHECK(layer_tree_host_);
 }
 
 RenderWidgetCompositor::~RenderWidgetCompositor() {}
 
 const base::WeakPtr<cc::InputHandler>&
 RenderWidgetCompositor::GetInputHandler() {
   return layer_tree_host_->GetInputHandler();
 }
@@ skipping 424 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       compositor_deps_->GetSharedMainThreadContextProvider();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content