Change to calculate the real NTP in TimeTicks.

base/time/time.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/time/time.h"
 
 #include <limits>
 #include <ostream>
 
 #include "base/float_util.h"
@@ skipping 171 matching lines @@
                                        is_local ? PR_FALSE : PR_TRUE,
                                        &result_time);
   if (PR_SUCCESS != result)
     return false;
 
   result_time += kTimeTToMicrosecondsOffset;
   *parsed_time = Time(result_time);
   return true;
 }
 
+// static
+TimeTicks TimeTicks::UnixEpoch() {
+  static const TimeTicks ticks_unix_epoch =

[jar (doing other things), 2013/10/25 01:13:54]

My guess is that you want a lazy singleton (probably can be leaky).

We don't like to have statics that are not POD (yeah... a silly TimeTicks
instance isn't POD... even though it just holds 64 bits inside).... and the code
as written is not thread safe.

+      TimeTicks::Now() - (Time::Now() - Time::UnixEpoch());
+  return ticks_unix_epoch;
+}
+
 // Time::Exploded -------------------------------------------------------------
 
 inline bool is_in_range(int value, int lo, int hi) {
   return lo <= value && value <= hi;
 }
 
 bool Time::Exploded::HasValidValues() const {
   return is_in_range(month, 1, 12) &&
          is_in_range(day_of_week, 0, 6) &&
          is_in_range(day_of_month, 1, 31) &&
          is_in_range(hour, 0, 23) &&
          is_in_range(minute, 0, 59) &&
          is_in_range(second, 0, 60) &&
          is_in_range(millisecond, 0, 999);
 }
 
 }  // namespace base