Limit InterProcessTimeTicksConverter to platforms that require it

base/time/time_mac.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 <CoreFoundation/CFDate.h>
 #include <CoreFoundation/CFTimeZone.h>
 #include <mach/mach.h>
 #include <mach/mach_time.h>
@@ skipping 241 matching lines @@
 TimeTicks TimeTicks::Now() {
   return TimeTicks(ComputeCurrentTicks());
 }
 
 // static
 bool TimeTicks::IsHighResolution() {
   return true;
 }
 
 // static
+bool TimeTicks::IsConsistentAcrossProcesses() {
+  return true;
+}
+
+// static
 TimeTicks::Clock TimeTicks::GetClock() {
 #if defined(OS_IOS)
   return Clock::IOS_CF_ABSOLUTE_TIME_MINUS_KERN_BOOTTIME;
 #else
   return Clock::MAC_MACH_ABSOLUTE_TIME;
 #endif  // defined(OS_IOS)
 }
 
 // static
 ThreadTicks ThreadTicks::Now() {
   return ThreadTicks(ComputeThreadTicks());
 }
 
 }  // namespace base