[Resource Timing] Expose redirect timing information

Source/core/page/PerformanceTiming.cpp

 /*
  * Copyright (C) 2010 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 195 matching lines @@
     int sslStart = timing->sslStart;
     if (sslStart < 0)
         return 0;
 
     return resourceLoadTimeRelativeToAbsolute(sslStart);
 }
 
 unsigned long long PerformanceTiming::requestStart() const
 {
     ResourceLoadTiming* timing = resourceLoadTiming();
-    if (!timing)
+    if (!timing || timing->sendStart < 0)
         return connectEnd();
 
     ASSERT(timing->sendStart >= 0);
     return resourceLoadTimeRelativeToAbsolute(timing->sendStart);
 }
 
 unsigned long long PerformanceTiming::responseStart() const
 {
     ResourceLoadTiming* timing = resourceLoadTiming();
-    if (!timing)
+    if (!timing || timing->receiveHeadersEnd < 0)
         return requestStart();
 
     // FIXME: Response start needs to be the time of the first received byte.
     // However, the ResourceLoadTiming API currently only supports the time
     // the last header byte was received. For many responses with reasonable
     // sized cookies, the HTTP headers fit into a single packet so this time
     // is basically equivalent. But for some responses, particularly those with
     // headers larger than a single packet, this time will be too late.
     ASSERT(timing->receiveHeadersEnd >= 0);
     return resourceLoadTimeRelativeToAbsolute(timing->receiveHeadersEnd);
@@ skipping 119 matching lines @@
 
 unsigned long long PerformanceTiming::monotonicTimeToIntegerMilliseconds(double monotonicSeconds) const
 {
     ASSERT(monotonicSeconds >= 0);
     const DocumentLoadTiming* timing = documentLoadTiming();
     ASSERT(timing);
     return toIntegerMilliseconds(timing->monotonicTimeToPseudoWallTime(monotonicSeconds));
 }
 
 } // namespace WebCore