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

content/gpu/gpu_child_thread.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_GPU_GPU_CHILD_THREAD_H_
 #define CONTENT_GPU_GPU_CHILD_THREAD_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 50 matching lines @@
   void OnInitialize();
   void OnCollectGraphicsInfo();
   void OnGetVideoMemoryUsageStats();
   void OnSetVideoMemoryWindowCount(uint32 window_count);
 
   void OnClean();
   void OnCrash();
   void OnHang();
   void OnDisableWatchdog();
 
+#if defined(TOOLKIT_GTK)
+  void OnAcceleratedCompositingStateChange(
+      int32 surface_id, bool compositing_active);
+#endif
+
 #if defined(USE_TCMALLOC)
   void OnGetGpuTcmalloc();
 #endif
 
   // Set this flag to true if a fatal error occurred before we receive the
   // OnInitialize message, in which case we just declare ourselves DOA.
   bool dead_on_arrival_;
   base::Time process_start_time_;
   scoped_refptr<GpuWatchdogThread> watchdog_thread_;
 
@@ skipping 12 matching lines @@
 
   // Whether the GPU thread is running in the browser process.
   bool in_browser_process_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_CHILD_THREAD_H_