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

content/browser/gpu/gpu_process_host_ui_shim.h

Index: content/browser/gpu/gpu_process_host_ui_shim.h
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.h b/content/browser/gpu/gpu_process_host_ui_shim.h
index f99d53227e2a71bcd074065d86597b4b540b4e25..c8e4b8cc58633492fc1d46997a933652aa385ecc 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.h
+++ b/content/browser/gpu/gpu_process_host_ui_shim.h
@@ -26,6 +26,7 @@ struct GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params;
 struct GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params;
 struct GpuHostMsg_AcceleratedSurfaceNew_Params;
 struct GpuHostMsg_AcceleratedSurfaceRelease_Params;
+struct GpuHostMsg_AcceleratedSurfaceRequestReleaseFront_Params;
 
 namespace gfx {
 class Size;
@@ -104,6 +105,8 @@ class GpuProcessHostUIShim
 #if defined(USE_AURA)
   void OnAcceleratedSurfaceRelease(
       const GpuHostMsg_AcceleratedSurfaceRelease_Params& params);
+  void OnAcceleratedSurfaceRequestReleaseFront(
+      const GpuHostMsg_AcceleratedSurfaceRequestReleaseFront_Params& params);
 #endif
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.