| Index: cc/ipc/mojo_compositor_frame_sink.mojom | 
| diff --git a/cc/ipc/mojo_compositor_frame_sink.mojom b/cc/ipc/mojo_compositor_frame_sink.mojom | 
| index cedd96615e4edc5190470ac314d472cb60c4fd94..ab152819739deb42b3b811f76e22b14c4c5e8f63 100644 | 
| --- a/cc/ipc/mojo_compositor_frame_sink.mojom | 
| +++ b/cc/ipc/mojo_compositor_frame_sink.mojom | 
| @@ -49,6 +49,8 @@ interface MojoCompositorFrameSinkClient { | 
|  | 
| // Returns resources sent to SubmitCompositorFrame to be reused or freed. | 
| ReclaimResources(ReturnedResourceArray resources); | 
| + | 
| +  WillDrawSurface(); | 
| }; | 
|  | 
| // MojoCompositorFrameSinkPrivate is used by the display compositor host to set | 
|  |