Enable ThreadTicks on Windows.

BUG=v8:5000

Review-Url: https://codereview.chromium.org/2106243002
Cr-Commit-Position: refs/heads/master@{#37454}

src/base/platform/time.cc

@@ -618,14 +618,14 @@ bool TimeTicks::IsHighResolutionClockWorking() {
 #endif  // V8_OS_WIN
 
 
-// TODO(lpy): For windows ThreadTicks implementation,
-// see http://crbug.com/v8/5000
 bool ThreadTicks::IsSupported() {
 #if (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \
-    defined(V8_OS_MACOSX) || defined(V8_OS_ANDROID)
-    return true;
+  defined(V8_OS_MACOSX) || defined(V8_OS_ANDROID)
+  return true;
+#elif defined(V8_OS_WIN)
+  return IsSupportedWin();
 #else
-    return false;
+  return false;
 #endif
 }
 

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

@@ -186,7 +186,6 @@ TEST(TimeTicks, IsMonotonic) {
 }
 
 
-// Disable on windows until it is implemented.
 #if V8_OS_ANDROID
 #define MAYBE_ThreadNow DISABLED_ThreadNow
 #else
@@ -194,6 +193,7 @@ TEST(TimeTicks, IsMonotonic) {
 #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.