Makes TraceTicks use the monotonic timer on Chrome OS

base/time/time_posix.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 <stdint.h>
 #include <sys/time.h>
 #include <time.h>
 #if defined(OS_ANDROID) && !defined(__LP64__)
@@ skipping 311 matching lines @@
 ThreadTicks ThreadTicks::Now() {
 #if (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \
     defined(OS_ANDROID)
   return ThreadTicks(ClockNow(CLOCK_THREAD_CPUTIME_ID));
 #else
   NOTREACHED();
   return ThreadTicks();
 #endif
 }
 
-// Use the Chrome OS specific system-wide clock.
-#if defined(OS_CHROMEOS)
-// static
-TraceTicks TraceTicks::Now() {
-  struct timespec ts;
-  if (clock_gettime(kClockSystemTrace, &ts) != 0) {
-    // NB: fall-back for a chrome os build running on linux
-    return TraceTicks(ClockNow(CLOCK_MONOTONIC));
-  }
-  return TraceTicks(ConvertTimespecToMicros(ts));
-}
-
-#else  // !defined(OS_CHROMEOS)
-
 // static
 TraceTicks TraceTicks::Now() {
   return TraceTicks(ClockNow(CLOCK_MONOTONIC));
 }
 
-#endif  // defined(OS_CHROMEOS)
-
 #endif  // !OS_MACOSX
 
 // static
 Time Time::FromTimeVal(struct timeval t) {
   DCHECK_LT(t.tv_usec, static_cast<int>(Time::kMicrosecondsPerSecond));
   DCHECK_GE(t.tv_usec, 0);
   if (t.tv_usec == 0 && t.tv_sec == 0)
     return Time();
   if (t.tv_usec == static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1 &&
       t.tv_sec == std::numeric_limits<time_t>::max())
@@ skipping 16 matching lines @@
     result.tv_usec = static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1;
     return result;
   }
   int64 us = us_ - kTimeTToMicrosecondsOffset;
   result.tv_sec = us / Time::kMicrosecondsPerSecond;
   result.tv_usec = us % Time::kMicrosecondsPerSecond;
   return result;
 }
 
 }  // namespace base