| Index: content/common/frame_messages.h | 
| diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h | 
| index 1a15567b6fed0c29303c89cc068f18c179085245..93d6629512ba89dee778729bf7115ca9601b133b 100644 | 
| --- a/content/common/frame_messages.h | 
| +++ b/content/common/frame_messages.h | 
| @@ -1496,11 +1496,12 @@ IPC_MESSAGE_ROUTED2(FrameHostMsg_SerializedHtmlWithLocalLinksResponse, | 
| bool /* end of data? */) | 
|  | 
| // Response to FrameMsg_SerializeAsMHTML. | 
| -IPC_MESSAGE_ROUTED3( | 
| +IPC_MESSAGE_ROUTED4( | 
| FrameHostMsg_SerializeAsMHTMLResponse, | 
| int /* job_id (used to match responses to requests) */, | 
| bool /* true if success, false if error */, | 
| -    std::set<std::string> /* digests of uris of serialized resources */) | 
| +    std::set<std::string> /* digests of uris of serialized resources */, | 
| +    base::TimeDelta /* how much time of the main render thread was used */) | 
|  | 
| // Sent when the renderer updates hint for importance of a tab. | 
| IPC_MESSAGE_ROUTED1(FrameHostMsg_UpdatePageImportanceSignals, | 
|  |