Import ConditionVariable class.

src/platform/time.cc

Index: src/platform/time.cc
diff --git a/src/platform/time.cc b/src/platform/time.cc
index 756be9375a82f9feb1e6aa785f909fdba88886ff..ea6dd2c0bae6cfea3fc947b4c6f841c91a58b875 100644
--- a/src/platform/time.cc
+++ b/src/platform/time.cc
@@ -126,7 +126,9 @@ int64_t TimeDelta::InNanoseconds() const {
 #if V8_OS_MACOSX
 
 TimeDelta TimeDelta::FromMachTimespec(struct mach_timespec ts) {
-  ASSERT(ts.tv_nsec >= 0);
+  ASSERT_GE(ts.tv_nsec, 0);
+  ASSERT_LT(ts.tv_nsec,
+            static_cast<long>(Time::kNanosecondsPerSecond));  // NOLINT
   return TimeDelta(ts.tv_sec * Time::kMicrosecondsPerSecond +
                    ts.tv_nsec / Time::kNanosecondsPerMicrosecond);
 }
@@ -144,6 +146,28 @@ struct mach_timespec TimeDelta::ToMachTimespec() const {
 #endif  // V8_OS_MACOSX
 
 
+#if V8_OS_POSIX
+
+TimeDelta TimeDelta::FromTimespec(struct timespec ts) {
+  ASSERT_GE(ts.tv_nsec, 0);
+  ASSERT_LT(ts.tv_nsec,
+            static_cast<long>(Time::kNanosecondsPerSecond));  // NOLINT
+  return TimeDelta(ts.tv_sec * Time::kMicrosecondsPerSecond +
+                   ts.tv_nsec / Time::kNanosecondsPerMicrosecond);
+}
+
+
+struct timespec TimeDelta::ToTimespec() const {
+  struct timespec ts;
+  ts.tv_sec = delta_ / Time::kMicrosecondsPerSecond;
+  ts.tv_nsec = (delta_ % Time::kMicrosecondsPerSecond) *
+      Time::kNanosecondsPerMicrosecond;
+  return ts;
+}
+
+#endif  // V8_OS_POSIX
+
+
 #if V8_OS_WIN
 
 // We implement time using the high-resolution timers so that we can get