Provide nanoseconds precision for base::PlatformFileInfo on POSIX

base/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.h"
 
 #include <math.h>
 #if defined(OS_WIN)
 #include <float.h>
 #endif
@@ skipping 98 matching lines @@
   if (is_null())
     return 0;  // Preserve 0 so we can tell it doesn't exist.
   if (is_max()) {
     // Preserve max without offset to prevent overflow.
     return std::numeric_limits<double>::max();
   }
   return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
           static_cast<double>(kMicrosecondsPerSecond));
 }
 
+#if defined(OS_POSIX)
+// static
+Time Time::FromTimeSpec(const timespec& ts) {
+  return FromDoubleT(ts.tv_sec +
+                     static_cast<double>(ts.tv_nsec) /
+                         base::Time::kNanosecondsPerSecond);
+}
+#endif
+
 // static
 Time Time::FromJsTime(double ms_since_epoch) {
   // The epoch is a valid time, so this constructor doesn't interpret
   // 0 as the null time.
   if (ms_since_epoch == std::numeric_limits<double>::max())
     return Max();
   return Time(static_cast<int64>(ms_since_epoch * kMicrosecondsPerMillisecond) +
               kTimeTToMicrosecondsOffset);
 }
 
@@ skipping 58 matching lines @@
   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