Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

content/browser/gpu/gpu_process_host_ui_shim.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_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #pragma once
 
 // This class lives on the UI thread and supports classes like the
 // BackingStoreProxy, which must live on the UI thread. The IO thread
 // portion of this class, the GpuProcessHost, is responsible for
 // shuttling messages between the browser and GPU processes.
 
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "content/common/content_export.h"
 #include "content/common/message_router.h"
 #include "content/public/common/gpu_info.h"
 
 struct GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params;
 struct GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params;
 struct GpuHostMsg_AcceleratedSurfaceNew_Params;
 struct GpuHostMsg_AcceleratedSurfaceRelease_Params;
+struct GpuHostMsg_AcceleratedSurfaceSuggestDiscard_Params;
 
 namespace gfx {
 class Size;
 }
 
 namespace IPC {
 class Message;
 }
 
 void RouteToGpuProcessHostUIShimTask(int host_id, const IPC::Message& msg);
@@ skipping 58 matching lines @@
   void OnAcceleratedSurfaceSuspend(int32 surface_id);
 
 #if defined(OS_MACOSX) || defined(USE_AURA)
   void OnAcceleratedSurfaceNew(
       const GpuHostMsg_AcceleratedSurfaceNew_Params& params);
 #endif
 
 #if defined(USE_AURA)
   void OnAcceleratedSurfaceRelease(
       const GpuHostMsg_AcceleratedSurfaceRelease_Params& params);
+  void OnAcceleratedSurfaceSuggestDiscard(
+      const GpuHostMsg_AcceleratedSurfaceSuggestDiscard_Params& params);
 #endif
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_