Enable ThreadTicks on Windows.

test/unittests/base/platform/time-unittest.cc

 // Copyright 2014 the V8 project 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 "src/base/platform/time.h"
 
 #if V8_OS_MACOSX
 #include <mach/mach_time.h>
 #endif
 #if V8_OS_POSIX
@@ skipping 168 matching lines @@
     EXPECT_GE(normal_ticks, previous_normal_ticks);
     EXPECT_GE((normal_ticks - previous_normal_ticks).InMicroseconds(), 0);
     EXPECT_GE(highres_ticks, previous_highres_ticks);
     EXPECT_GE((highres_ticks - previous_highres_ticks).InMicroseconds(), 0);
     previous_normal_ticks = normal_ticks;
     previous_highres_ticks = highres_ticks;
   }
 }
 
 
-// Disable on windows until it is implemented.
 #if V8_OS_ANDROID
 #define MAYBE_ThreadNow DISABLED_ThreadNow
 #else
 #define MAYBE_ThreadNow ThreadNow
 #endif
 TEST(ThreadTicks, MAYBE_ThreadNow) {
   if (ThreadTicks::IsSupported()) {
+    ThreadTicks::WaitUntilInitialized();
     TimeTicks begin = TimeTicks::Now();
     ThreadTicks begin_thread = ThreadTicks::Now();
     // Make sure that ThreadNow value is non-zero.
     EXPECT_GT(begin_thread, ThreadTicks());
     // Sleep for 10 milliseconds to get the thread de-scheduled.
     OS::Sleep(base::TimeDelta::FromMilliseconds(10));
     ThreadTicks end_thread = ThreadTicks::Now();
     TimeTicks end = TimeTicks::Now();
     TimeDelta delta = end - begin;
     TimeDelta delta_thread = end_thread - begin_thread;
@@ skipping 45 matching lines @@
     // const int kMaxTime = 35;  // Maximum acceptible milliseconds for test.
     // EXPECT_LT((stop - start).InMilliseconds(), kMaxTime);
     printf("%s: %1.2fus per call\n", test_case.description,
            (stop - start).InMillisecondsF() * 1000 / kLoops);
   }
 }
 #endif  // V8_OS_WIN
 
 }  // namespace base
 }  // namespace v8