Clean up GPU back-pressure with remote CALayers

content/common/gpu/image_transport_surface.h

 // Copyright (c) 2012 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_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 124 matching lines @@
   static void SetSwapInterval(gfx::GLContext* context);
 
   GpuChannelManager* manager() const { return manager_; }
   GpuCommandBufferStub* stub() const { return stub_.get(); }
 
  private:
   gpu::GpuScheduler* Scheduler();
   gpu::gles2::GLES2Decoder* Decoder();
 
   // IPC::Message handlers.
+#if defined(OS_MACOSX)
   void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params);
+#endif
   void OnWakeUpGpu();
 
   // Backbuffer resize callback.
   void Resize(gfx::Size size, float scale_factor);
 
   void SetLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info);
 
   // Weak pointers that point to objects that outlive this helper.
   ImageTransportSurface* surface_;
   GpuChannelManager* manager_;
@@ skipping 16 matching lines @@
                                    gfx::GLSurface* surface);
 
   // GLSurface implementation.
   virtual bool Initialize() override;
   virtual void Destroy() override;
   virtual bool SwapBuffers() override;
   virtual bool PostSubBuffer(int x, int y, int width, int height) override;
   virtual bool OnMakeCurrent(gfx::GLContext* context) override;
 
   // ImageTransportSurface implementation.
+#if defined(OS_MACOSX)
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
+#endif
   virtual void OnResize(gfx::Size size, float scale_factor) override;
   virtual gfx::Size GetSize() override;
   virtual void SetLatencyInfo(
       const std::vector<ui::LatencyInfo>& latency_info) override;
   virtual void WakeUpGpu() override;
 
  protected:
   virtual ~PassThroughImageTransportSurface();
 
   // If updated vsync parameters can be determined, send this information to
   // the browser.
   virtual void SendVSyncUpdateIfAvailable();
 
   ImageTransportHelper* GetHelper() { return helper_.get(); }
 
  private:
   scoped_ptr<ImageTransportHelper> helper_;
   bool did_set_swap_interval_;
   std::vector<ui::LatencyInfo> latency_info_;
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughImageTransportSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_