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diff --git a/Source/WTF/wtf/TimeWithDynamicClockType.cpp b/Source/WTF/wtf/TimeWithDynamicClockType.cpp
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+++ b/Source/WTF/wtf/TimeWithDynamicClockType.cpp
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+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "TimeWithDynamicClockType.h"
+
+#include "Condition.h"
+#include "Lock.h"
+#include "PrintStream.h"
+#include <cfloat>
+#include <cmath>
+#include <wtf/DataLog.h>
+
+namespace WTF {
+
+TimeWithDynamicClockType TimeWithDynamicClockType::now(ClockType type)
+{
+    switch (type) {
+    case ClockType::Wall:
+        return WallTime::now();
+    case ClockType::Monotonic:
+        return MonotonicTime::now();
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+    return TimeWithDynamicClockType();
+}
+
+TimeWithDynamicClockType TimeWithDynamicClockType::nowWithSameClock() const
+{
+    return now(clockType());
+}
+
+WallTime TimeWithDynamicClockType::wallTime() const
+{
+    RELEASE_ASSERT(m_type == ClockType::Wall);
+    return WallTime::fromRawSeconds(m_value);
+}
+
+MonotonicTime TimeWithDynamicClockType::monotonicTime() const
+{
+    RELEASE_ASSERT(m_type == ClockType::Monotonic);
+    return MonotonicTime::fromRawSeconds(m_value);
+}
+
+WallTime TimeWithDynamicClockType::approximateWallTime() const
+{
+    switch (m_type) {
+    case ClockType::Wall:
+        return wallTime();
+    case ClockType::Monotonic:
+        return monotonicTime().approximateWallTime();
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+    return WallTime();
+}
+
+MonotonicTime TimeWithDynamicClockType::approximateMonotonicTime() const
+{
+    switch (m_type) {
+    case ClockType::Wall:
+        return wallTime().approximateMonotonicTime();
+    case ClockType::Monotonic:
+        return monotonicTime();
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+    return MonotonicTime();
+}
+
+Seconds TimeWithDynamicClockType::operator-(const TimeWithDynamicClockType& other) const
+{
+    RELEASE_ASSERT(m_type == other.m_type);
+    return Seconds(m_value - other.m_value);
+}
+
+bool TimeWithDynamicClockType::operator<(const TimeWithDynamicClockType& other) const
+{
+    RELEASE_ASSERT(m_type == other.m_type);
+    return m_value < other.m_value;
+}
+
+bool TimeWithDynamicClockType::operator>(const TimeWithDynamicClockType& other) const
+{
+    RELEASE_ASSERT(m_type == other.m_type);
+    return m_value > other.m_value;
+}
+
+bool TimeWithDynamicClockType::operator<=(const TimeWithDynamicClockType& other) const
+{
+    RELEASE_ASSERT(m_type == other.m_type);
+    return m_value <= other.m_value;
+}
+
+bool TimeWithDynamicClockType::operator>=(const TimeWithDynamicClockType& other) const
+{
+    RELEASE_ASSERT(m_type == other.m_type);
+    return m_value >= other.m_value;
+}
+
+void TimeWithDynamicClockType::dump(PrintStream& out) const
+{
+    out.print(m_type, "(", m_value, " sec)");
+}
+
+void sleep(const TimeWithDynamicClockType& time)
+{
+    Lock fakeLock;
+    Condition fakeCondition;
+    LockHolder fakeLocker(fakeLock);
+    fakeCondition.waitUntil(fakeLock, time);
+}
+
+bool hasElapsed(const TimeWithDynamicClockType& time)
+{
+    // Avoid doing now().
+    if (!(time > time.withSameClockAndRawSeconds(0)))
+        return true;
+    if (std::isinf(time.secondsSinceEpoch().value()))
+        return false;
+    
+    return time <= time.nowWithSameClock();
+}
+
+} // namespace WTF
+
+