WIP: move OffscreenCanvas into new display compositor

components/display_compositor/gpu_display_compositor_frame_sink.h

 // Copyright 2017 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 COMPONENTS_DISPLAY_COMPOSITOR_GPU_DISPLAY_COMPOSITOR_FRAME_SINK_H_
 #define COMPONENTS_DISPLAY_COMPOSITOR_GPU_DISPLAY_COMPOSITOR_FRAME_SINK_H_
 
 #include "cc/surfaces/display.h"
 #include "cc/surfaces/display_client.h"
-#include "components/display_compositor/gpu_compositor_frame_sink.h"
+#include "components/display_compositor/gpu_compositor_frame_sink_base.h"
 #include "components/display_compositor/gpu_compositor_frame_sink_delegate.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 
 namespace display_compositor {
 
 class DISPLAY_COMPOSITOR_EXPORT GpuDisplayCompositorFrameSink
-    : public GpuCompositorFrameSink,
+    : public GpuCompositorFrameSinkBase,
       public NON_EXPORTED_BASE(cc::mojom::DisplayPrivate),
       public NON_EXPORTED_BASE(cc::DisplayClient) {
  public:
   GpuDisplayCompositorFrameSink(
       GpuCompositorFrameSinkDelegate* delegate,
       cc::SurfaceManager* surface_manager,
       const cc::FrameSinkId& frame_sink_id,
       std::unique_ptr<cc::Display> display,
       std::unique_ptr<cc::BeginFrameSource> begin_frame_source,
       cc::mojom::MojoCompositorFrameSinkAssociatedRequest request,
@@ skipping 27 matching lines @@
   // gpu::SurfaceHandle.
   std::unique_ptr<cc::BeginFrameSource> display_begin_frame_source_;
   std::unique_ptr<cc::Display> display_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuDisplayCompositorFrameSink);
 };
 
 }  // namespace display_compositor
 
 #endif  // COMPONENTS_DISPLAY_COMPOSITOR_GPU_DISPLAY_COMPOSITOR_FRAME_SINK_H_