(not for review) Fix composited-to-non-composited corruption on Linux.

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 160 matching lines @@
 }
 
 void GpuProcessHostUIShim::SimulateCrash() {
   Send(new GpuMsg_Crash());
 }
 
 void GpuProcessHostUIShim::SimulateHang() {
   Send(new GpuMsg_Hang());
 }
 
+#if defined(TOOLKIT_GTK)
+void GpuProcessHostUIShim::AcceleratedCompositingStateChange(
+    int32 surface_id, bool compositing_active) {
+  Send(new GpuMsg_AcceleratedCompositingStateChange(
+      surface_id, compositing_active));
+}
+#endif
+
 GpuProcessHostUIShim::~GpuProcessHostUIShim() {
   DCHECK(CalledOnValidThread());
   g_hosts_by_id.Pointer()->Remove(host_id_);
 }
 
 bool GpuProcessHostUIShim::OnControlMessageReceived(
     const IPC::Message& message) {
   DCHECK(CalledOnValidThread());
 
   IPC_BEGIN_MESSAGE_MAP(GpuProcessHostUIShim, message)
@@ skipping 201 matching lines @@
   view->AcceleratedSurfaceRelease();
 }
 
 void GpuProcessHostUIShim::OnVideoMemoryUsageStatsReceived(
     const GPUVideoMemoryUsageStats& video_memory_usage_stats) {
   GpuDataManagerImpl::GetInstance()->UpdateVideoMemoryUsageStats(
       video_memory_usage_stats);
 }
 
 }  // namespace content