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

content/browser/gpu/gpu_process_host_ui_shim.cc

 // 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.
 
 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 198 matching lines @@
 #endif
 
 #if defined(USE_AURA)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceNew,
                         OnAcceleratedSurfaceNew)
 #endif
 
 #if defined(USE_AURA)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceRelease,
                         OnAcceleratedSurfaceRelease)
+    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceSuggestDiscard,
+                        OnAcceleratedSurfaceSuggestDiscard)
 #endif
 
     IPC_MESSAGE_UNHANDLED_ERROR()
   IPC_END_MESSAGE_MAP()
 
   return true;
 }
 
 void GpuProcessHostUIShim::OnLogMessage(
     int level,
@@ skipping 158 matching lines @@
 
 void GpuProcessHostUIShim::OnAcceleratedSurfaceRelease(
     const GpuHostMsg_AcceleratedSurfaceRelease_Params& params) {
   RenderWidgetHostViewPort* view = GetRenderWidgetHostViewFromSurfaceID(
       params.surface_id);
   if (!view)
     return;
   view->AcceleratedSurfaceRelease(params.identifier);
 }
 
+void GpuProcessHostUIShim::OnAcceleratedSurfaceSuggestDiscard(
+    const GpuHostMsg_AcceleratedSurfaceSuggestDiscard_Params& params) {
+  RenderWidgetHostViewPort* view = GetRenderWidgetHostViewFromSurfaceID(
+      params.surface_id);
+  if (!view)
+    return;
+  view->AcceleratedSurfaceSuggestDiscard(params.identifier,
+                                         params.route_id,
+                                         host_id_);
+}
+
 #endif