(DEPRECATED) Send navigation_start to browser process in DidStartProvisionalLoad

third_party/WebKit/public/web/WebDataSource.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 85 matching lines @@
     virtual ExtraData* extraData() const = 0;
     virtual void setExtraData(ExtraData*) = 0;
 
     // Sets the navigation start time for this datasource. Ordinarily,
     // navigation start is determined in WebCore. But, in some situations,
     // the embedder might have a better value and can override it here. This
     // should be called before WebFrameClient::didCommitProvisionalLoad.
     // Calling it later may confuse users, because JavaScript may have run and
     // the user may have already recorded the original value.
     virtual void setNavigationStartTime(double) = 0;
+    // Gets the navigation start time. Useful if the embedder wants the
+    // navigation start time in the same format they set it in, rather than the
+    // wall time that WebPerformance reports.
+    virtual double getNavigationStartTime() = 0;

[clamy, 2015/10/28 12:40:01]

What is the issue with getting the time back as a wall time?

[Charlie Harrison, 2015/10/28 14:45:00]

DocumentLoadTiming stores the timing as TimeTicks doubles, but PerformanceTiming
/ WebPerformance converts them to time since epoch for reporting to javascript.
I'll update the comment to be more clear.

 
 protected:
     ~WebDataSource() { }
 };
 
 } // namespace blink
 
 #endif