cc: Make most of cc::OutputSurface abstract.

content/browser/compositor/gpu_browser_compositor_output_surface.h

 // Copyright 2014 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_BROWSER_COMPOSITOR_GPU_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_GPU_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include <memory>
 
 #include "base/cancelable_callback.h"
@@ skipping 37 matching lines @@
   void OnReflectorChanged() override;
   void OnGpuSwapBuffersCompleted(
       const std::vector<ui::LatencyInfo>& latency_info,
       gfx::SwapResult result,
       const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac) override;
 #if defined(OS_MACOSX)
   void SetSurfaceSuspendedForRecycle(bool suspended) override;
 #endif
 
   // cc::OutputSurface implementation.
+  bool BindToClient(cc::OutputSurfaceClient* client) override;
+  void EnsureBackbuffer() override;
+  void DiscardBackbuffer() override;
+  void BindFramebuffer() override;
   void SwapBuffers(cc::CompositorFrame frame) override;
-  bool BindToClient(cc::OutputSurfaceClient* client) override;
   uint32_t GetFramebufferCopyTextureFormat() override;
+  bool IsDisplayedAsOverlayPlane() const override;
+  unsigned GetOverlayTextureId() const override;
+  bool SurfaceIsSuspendForRecycle() const override;
 
   gpu::CommandBufferProxyImpl* GetCommandBufferProxy();
 
   base::CancelableCallback<void(
       const std::vector<ui::LatencyInfo>&,
       gfx::SwapResult,
       const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac)>
       swap_buffers_completion_callback_;
   base::CancelableCallback<void(base::TimeTicks timebase,
                                 base::TimeDelta interval)>
       update_vsync_parameters_callback_;
 
   std::unique_ptr<ReflectorTexture> reflector_texture_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuBrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_GPU_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_