| Index: content/common/frame_messages.h | 
| diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h | 
| index c8a87153376923212798bfd331710963277d83c8..c192d23651128748f8a213f2069d27d3d6d4da54 100644 | 
| --- a/content/common/frame_messages.h | 
| +++ b/content/common/frame_messages.h | 
| @@ -681,3 +681,7 @@ IPC_MESSAGE_ROUTED1(FrameHostMsg_BeginNavigation, | 
| // Sent once a paint happens after the first non empty layout. In other words | 
| // after the frame has painted something. | 
| IPC_MESSAGE_ROUTED0(FrameHostMsg_DidFirstVisuallyNonEmptyPaint) | 
| + | 
| +// Sent when a WebUI page that uses Mojo has executed its 'main' module. Our | 
| +// javascript based testing framework must wait until this has happened. | 
| +IPC_MESSAGE_ROUTED0(FrameHostMsg_WebUIMojoMainRan) | 
|  |