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diff --git a/Source/WTF/wtf/TimeWithDynamicClockType.h b/Source/WTF/wtf/TimeWithDynamicClockType.h
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+++ b/Source/WTF/wtf/TimeWithDynamicClockType.h
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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. 
+ */
+
+#ifndef WTF_TimeWithDynamicClockType_h
+#define WTF_TimeWithDynamicClockType_h
+
+#include <wtf/ClockType.h>
+#include <wtf/MonotonicTime.h>
+#include <wtf/WallTime.h>
+
+namespace WTF {
+
+class PrintStream;
+
+class TimeWithDynamicClockType {
+public:
+    TimeWithDynamicClockType() { }
+    
+    TimeWithDynamicClockType(WallTime time)
+        : m_value(time.secondsSinceEpoch().value())
+        , m_type(ClockType::Wall)
+    {
+    }
+    
+    TimeWithDynamicClockType(MonotonicTime time)
+        : m_value(time.secondsSinceEpoch().value())
+        , m_type(ClockType::Monotonic)
+    {
+    }
+    
+    static TimeWithDynamicClockType fromRawSeconds(double value, ClockType type)
+    {
+        TimeWithDynamicClockType result;
+        result.m_value = value;
+        result.m_type = type;
+        return result;
+    }
+    
+    Seconds secondsSinceEpoch() const { return Seconds(m_value); }
+    ClockType clockType() const { return m_type; }
+    
+    WTF_EXPORT_PRIVATE static TimeWithDynamicClockType now(ClockType);
+    
+    WTF_EXPORT_PRIVATE TimeWithDynamicClockType nowWithSameClock() const;
+    
+    TimeWithDynamicClockType withSameClockAndRawSeconds(double value) const
+    {
+        return TimeWithDynamicClockType::fromRawSeconds(value, clockType());
+    }
+    
+    // Asserts that the time is of the type you want.
+    WTF_EXPORT_PRIVATE WallTime wallTime() const;
+    WTF_EXPORT_PRIVATE MonotonicTime monotonicTime() const;
+    
+    WTF_EXPORT_PRIVATE WallTime approximateWallTime() const;
+    WTF_EXPORT_PRIVATE MonotonicTime approximateMonotonicTime() const;
+    
+    explicit operator bool() const { return !!m_value; }
+    
+    TimeWithDynamicClockType operator+(Seconds other) const
+    {
+        return withSameClockAndRawSeconds(m_value + other.value());
+    }
+    
+    TimeWithDynamicClockType operator-(Seconds other) const
+    {
+        return withSameClockAndRawSeconds(m_value - other.value());
+    }
+    
+    // Time is a scalar and scalars can be negated as this could arise from algebraic
+    // transformations. So, we allow it.
+    TimeWithDynamicClockType operator-() const
+    {
+        return withSameClockAndRawSeconds(-m_value);
+    }
+    
+    TimeWithDynamicClockType operator+=(Seconds other)
+    {
+        return *this = *this + other;
+    }
+    
+    TimeWithDynamicClockType operator-=(Seconds other)
+    {
+        return *this = *this - other;
+    }
+    
+    WTF_EXPORT_PRIVATE Seconds operator-(const TimeWithDynamicClockType&) const;
+    
+    bool operator==(const TimeWithDynamicClockType& other) const
+    {
+        return m_value == other.m_value
+            && m_type == other.m_type;
+    }
+    
+    bool operator!=(const TimeWithDynamicClockType& other) const
+    {
+        return !(*this == other);
+    }
+    
+    // To do relative comparisons, you must be using times with the same clock type.
+    WTF_EXPORT_PRIVATE bool operator<(const TimeWithDynamicClockType&) const;
+    WTF_EXPORT_PRIVATE bool operator>(const TimeWithDynamicClockType&) const;
+    WTF_EXPORT_PRIVATE bool operator<=(const TimeWithDynamicClockType&) const;
+    WTF_EXPORT_PRIVATE bool operator>=(const TimeWithDynamicClockType&) const;
+    
+    WTF_EXPORT_PRIVATE void dump(PrintStream&) const;
+    
+private:
+    double m_value { 0 };
+    ClockType m_type { ClockType::Wall };
+};
+
+WTF_EXPORT_PRIVATE void sleep(const TimeWithDynamicClockType&);
+
+WTF_EXPORT_PRIVATE bool hasElapsed(const TimeWithDynamicClockType&);
+
+} // namespace WTF
+
+using WTF::TimeWithDynamicClockType;
+using WTF::hasElapsed;
+using WTF::sleep;
+
+#endif // WTF_TimeWithDynamicClockType_h