| Index: content/browser/frame_host/navigator_delegate.h | 
| diff --git a/content/browser/frame_host/navigator_delegate.h b/content/browser/frame_host/navigator_delegate.h | 
| index 56f10d76a3e556d91b930d3c1a43c5e1fb19978e..718c3b8cfd2831b9cf4e3d0839e4b8baa9ab0318 100644 | 
| --- a/content/browser/frame_host/navigator_delegate.h | 
| +++ b/content/browser/frame_host/navigator_delegate.h | 
| @@ -33,6 +33,10 @@ class CONTENT_EXPORT NavigatorDelegate { | 
| bool is_error_page, | 
| bool is_iframe_srcdoc) {} | 
|  | 
| +  // The |render_frame_host| started a transition-flagged navigation. | 
| +  virtual void DidStartNavigationTransition( | 
| +      RenderFrameHostImpl* render_frame_host) {} | 
| + | 
| // A provisional load in |render_frame_host| failed. | 
| virtual void DidFailProvisionalLoadWithError( | 
| RenderFrameHostImpl* render_frame_host, | 
|  |