| Index: content/gpu/gpu_child_thread.h | 
| diff --git a/content/gpu/gpu_child_thread.h b/content/gpu/gpu_child_thread.h | 
| index ff0c9258cd11fed094001d32487961a8d65e3ea4..73e2e83f448439261d1753bca9e403e11d75d79b 100644 | 
| --- a/content/gpu/gpu_child_thread.h | 
| +++ b/content/gpu/gpu_child_thread.h | 
| @@ -68,6 +68,11 @@ class GpuChildThread : public ChildThread { | 
| void OnHang(); | 
| void OnDisableWatchdog(); | 
|  | 
| +#if defined(TOOLKIT_GTK) | 
| +  void OnAcceleratedCompositingStateChange( | 
| +      int32 surface_id, bool compositing_active); | 
| +#endif | 
| + | 
| #if defined(USE_TCMALLOC) | 
| void OnGetGpuTcmalloc(); | 
| #endif | 
|  |