Make base work on iOS

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 51 matching lines @@
   result /= timebase_info.denom;
 
   // Don't bother with the rollover handling that the Windows version does.
   // With numer and denom = 1 (the expected case), the 64-bit absolute time
   // reported in nanoseconds is enough to last nearly 585 years.
   return base::checked_cast<int64_t>(result.ValueOrDie());
 #endif  // defined(OS_IOS)
 }
 
 int64_t ComputeThreadTicks() {
-#if defined(OS_IOS)
-  NOTREACHED();
-  return 0;
-#else
   base::mac::ScopedMachSendRight thread(mach_thread_self());
   mach_msg_type_number_t thread_info_count = THREAD_BASIC_INFO_COUNT;
   thread_basic_info_data_t thread_info_data;
 
   if (thread.get() == MACH_PORT_NULL) {
     DLOG(ERROR) << "Failed to get mach_thread_self()";
     return 0;
   }
 
   kern_return_t kr = thread_info(
       thread,
       THREAD_BASIC_INFO,
       reinterpret_cast<thread_info_t>(&thread_info_data),
       &thread_info_count);
   MACH_DCHECK(kr == KERN_SUCCESS, kr) << "thread_info";
 
   base::CheckedNumeric<int64_t> absolute_micros(
       thread_info_data.user_time.seconds);
   absolute_micros *= base::Time::kMicrosecondsPerSecond;
   absolute_micros += thread_info_data.user_time.microseconds;
   return absolute_micros.ValueOrDie();
-#endif  // defined(OS_IOS)
 }
 
 }  // namespace
 
 namespace base {
 
 // The Time routines in this file use Mach and CoreFoundation APIs, since the
 // POSIX definition of time_t in Mac OS X wraps around after 2038--and
 // there are already cookie expiration dates, etc., past that time out in
 // the field.  Using CFDate prevents that problem, and using mach_absolute_time
@@ skipping 122 matching lines @@
 ThreadTicks ThreadTicks::Now() {
   return ThreadTicks(ComputeThreadTicks());
 }
 
 // static
 TraceTicks TraceTicks::Now() {
   return TraceTicks(ComputeCurrentTicks());
 }
 
 }  // namespace base