Clean up GPU back-pressure with remote CALayers

content/common/gpu/image_transport_surface_fbo_mac.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_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/gpu/gpu_command_buffer_stub.h"
@@ skipping 35 matching lines @@
     virtual void SwapBuffers(const gfx::Size& size, float scale_factor) = 0;
 
     // Indicate that the backbuffer will be written to.
     virtual void WillWriteToBackbuffer() = 0;
 
     // Indicate that the backbuffer has been discarded and should not be seen
     // again.
     virtual void DiscardBackbuffer() = 0;
 
     // Called once for every SwapBuffers call when the IPC for the present has
-    // been processed by the browser.
-    virtual void SwapBuffersAckedByBrowser() = 0;
+    // been processed by the browser. |disable_throttling| is set if the
+    // browser suspects that GPU back-pressure should be disabled.
+    virtual void SwapBuffersAckedByBrowser(bool disable_throttling) = 0;
   };
 
   ImageTransportSurfaceFBO(GpuChannelManager* manager,
                            GpuCommandBufferStub* stub,
                            gfx::PluginWindowHandle handle);
 
   // GLSurface implementation
   virtual bool Initialize() override;
   virtual void Destroy() override;
   virtual bool DeferDraws() override;
@@ skipping 59 matching lines @@
   std::vector<ui::LatencyInfo> latency_info_;
 
   scoped_ptr<ImageTransportHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
 };
 
 }  // namespace content
 
 #endif  //  CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_MAC_H_