mustash: enable GPU Compositing in renderer

content/renderer/render_widget_mus_connection.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_MUS_CONNECTION_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_MUS_CONNECTION_H_
 
 #include "base/macros.h"
+#include "components/mus/public/cpp/output_surface.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_observer.h"
 #include "components/mus/public/cpp/window_surface.h"
 #include "components/mus/public/cpp/window_tree_connection.h"
 #include "components/mus/public/cpp/window_tree_delegate.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
+namespace {
+class OutputSurface;
+}  // namespace
+
 namespace content {
 
 class RenderWidgetMusConnection : public mus::WindowTreeDelegate,
                                   public mus::WindowObserver {
  public:
   RenderWidgetMusConnection(
       int routing_id,
       mojo::InterfaceRequest<mus::mojom::WindowTreeClient> request);
   ~RenderWidgetMusConnection() override;
 
+  scoped_ptr<cc::OutputSurface> CreateOutputSurface();
+
+  static RenderWidgetMusConnection* Get(int routing_id);
+
  private:
   void SubmitCompositorFrame();
 
   // WindowTreeDelegate implementation:
   void OnConnectionLost(mus::WindowTreeConnection* connection) override;
   void OnEmbed(mus::Window* root) override;
   void OnUnembed() override;
   void OnWindowBoundsChanged(mus::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
 
   const int routing_id_;
   mus::Window* root_;
   scoped_ptr<mus::WindowSurface> surface_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetMusConnection);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_MUS_CONNECTION_H_