Fix ResourceLoadTiming resolution lose issue.

Source/core/platform/network/ResourceLoadTiming.h

 /*
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 65 matching lines @@
     }
 
     bool operator!=(const ResourceLoadTiming& other) const
     {
         return !(*this == other);
     }
 
     // We want to present a unified timeline to Javascript. Using walltime is problematic, because the clock may skew while resources
     // load. To prevent that skew, we record a single reference walltime when root document navigation begins. All other times are
     // recorded using monotonicallyIncreasingTime(). When a time needs to be presented to Javascript, we build a pseudo-walltime
+#ifdef ENABLE_DOUBLE_RESOURCE_LOAD_TIMING
+    // using the following equation (requestTime as example):
+    //   pseudo time = document wall reference + (requestTime - document monotonic reference).
+    double requestTime; // All monotonicallyIncreasingTime() in seconds
+    double proxyStart;
+    double proxyEnd;
+    double dnsStart;
+    double dnsEnd;
+    double connectStart;
+    double connectEnd;
+    double sendStart;
+    double sendEnd;
+    double receiveHeadersEnd;
+    double sslStart;
+    double sslEnd;
+
+    double calculateMillisecondDelta(double time) const { return (time - requestTime) * 1000; }
+#else
     // using the following equation:
     //   pseudo time = document wall reference + (resource request time - document monotonic reference) + deltaMilliseconds / 1000.0.
     double convertResourceLoadTimeToMonotonicTime(int deltaMilliseconds) const;
 
     double requestTime; // monotonicallyIncreasingTime() when the port started handling this request.
     int proxyStart; // The rest of these are millisecond deltas, using monotonicallyIncreasingTime(), from requestTime.
     int proxyEnd;
     int dnsStart;
     int dnsEnd;
     int connectStart;
     int connectEnd;
     int sendStart;
     int sendEnd;
     int receiveHeadersEnd;
     int sslStart;
     int sslEnd;
+#endif
 
 private:
     ResourceLoadTiming()
+#ifdef ENABLE_DOUBLE_RESOURCE_LOAD_TIMING
         : requestTime(0)
-        , proxyStart(-1)
-        , proxyEnd(-1)
-        , dnsStart(-1)
-        , dnsEnd(-1)
-        , connectStart(-1)
-        , connectEnd(-1)
+        , proxyStart(0)
+        , proxyEnd(0)
+        , dnsStart(0)
+        , dnsEnd(0)
+        , connectStart(0)
+        , connectEnd(0)
         , sendStart(0)
         , sendEnd(0)
         , receiveHeadersEnd(0)
-        , sslStart(-1)
-        , sslEnd(-1)
+        , sslStart(0)
+        , sslEnd(0)
+#else
+    : requestTime(0)
+    , proxyStart(-1)
+    , proxyEnd(-1)
+    , dnsStart(-1)
+    , dnsEnd(-1)
+    , connectStart(-1)
+    , connectEnd(-1)
+    , sendStart(0)
+    , sendEnd(0)
+    , receiveHeadersEnd(0)
+    , sslStart(-1)
+    , sslEnd(-1)
+#endif
     {
     }
 };
 
 }
 
 #endif