Add IPC allowing GPU process to tell browser process to temporarily drop a front buffer.

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/debug/trace_event.h"
@@ skipping 169 matching lines @@
   DCHECK(CalledOnValidThread());
 
   IPC_BEGIN_MESSAGE_MAP(GpuProcessHostUIShim, message)
     IPC_MESSAGE_HANDLER(GpuHostMsg_OnLogMessage,
                         OnLogMessage)
 
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
                         OnAcceleratedSurfaceBuffersSwapped)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfacePostSubBuffer,
                         OnAcceleratedSurfacePostSubBuffer)
+    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceSuspend,
+                        OnAcceleratedSurfaceSuspend)
     IPC_MESSAGE_HANDLER(GpuHostMsg_GraphicsInfoCollected,
                         OnGraphicsInfoCollected)
 
 #if defined(TOOLKIT_USES_GTK) || defined(OS_WIN)
     IPC_MESSAGE_HANDLER(GpuHostMsg_ResizeView, OnResizeView)
 #endif
 
 #if defined(OS_MACOSX) || defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
     IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceNew,
                         OnAcceleratedSurfaceNew)
@@ skipping 164 matching lines @@
       params.surface_id);
   if (!view)
     return;
 
   delayed_send.Cancel();
 
   // View must send ACK message after next composite.
   view->AcceleratedSurfacePostSubBuffer(params, host_id_);
 }
 
+void GpuProcessHostUIShim::OnAcceleratedSurfaceSuspend(int32 surface_id) {
+  TRACE_EVENT0("renderer",
+      "GpuProcessHostUIShim::OnAcceleratedSurfaceSuspend");
+
+  RenderWidgetHostView* view = GetRenderWidgetHostViewFromSurfaceID(surface_id);
+  if (!view)
+    return;
+
+  view->AcceleratedSurfaceSuspend();
+}
+
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
 
 void GpuProcessHostUIShim::OnAcceleratedSurfaceRelease(
     const GpuHostMsg_AcceleratedSurfaceRelease_Params& params) {
   RenderWidgetHostView* view = GetRenderWidgetHostViewFromSurfaceID(
       params.surface_id);
   if (!view)
     return;
   view->AcceleratedSurfaceRelease(params.identifier);
 }
 
 #endif