Make base work on iOS

base/time/time.h

 // 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.
 
 // Time represents an absolute point in coordinated universal time (UTC),
 // internally represented as microseconds (s/1,000,000) since the Windows epoch
 // (1601-01-01 00:00:00 UTC). System-dependent clock interface routines are
 // defined in time_PLATFORM.cc. Note that values for Time may skew and jump
 // around as the operating system makes adjustments to synchronize (e.g., with
 // NTP servers). Thus, client code that uses the Time class must account for
@@ skipping 715 matching lines @@
 // Represents a clock, specific to a particular thread, than runs only while the
 // thread is running.
 class BASE_EXPORT ThreadTicks : public time_internal::TimeBase<ThreadTicks> {
  public:
   ThreadTicks() : TimeBase(0) {
   }
 
   // Returns true if ThreadTicks::Now() is supported on this system.
   static bool IsSupported() {
 #if (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \
-    (defined(OS_MACOSX) && !defined(OS_IOS)) || defined(OS_ANDROID)
+    defined(OS_MACOSX) || defined(OS_ANDROID)
     return true;
 #else
     return false;
 #endif
   }
 
   // Returns thread-specific CPU-time on systems that support this feature.
   // Needs to be guarded with a call to IsSupported(). Use this timer
   // to (approximately) measure how much time the calling thread spent doing
   // actual work vs. being de-scheduled. May return bogus results if the thread
@@ skipping 54 matching lines @@
   explicit TraceTicks(int64 us) : TimeBase(us) {
   }
 };
 
 // For logging use only.
 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TraceTicks time_ticks);
 
 }  // namespace base
 
 #endif  // BASE_TIME_TIME_H_