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diff --git a/Source/WTF/wtf/SchedulePair.h b/Source/WTF/wtf/SchedulePair.h
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+++ b/Source/WTF/wtf/SchedulePair.h
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+/*
+ * Copyright (C) 2008, 2013 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 SchedulePair_h
+#define SchedulePair_h
+
+#include <wtf/HashSet.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RetainPtr.h>
+#include <wtf/text/StringHash.h>
+#include <wtf/text/WTFString.h>
+
+#if PLATFORM(MAC)
+OBJC_CLASS NSRunLoop;
+#endif
+
+namespace WTF {
+
+class SchedulePair : public RefCounted<SchedulePair> {
+public:
+    static PassRefPtr<SchedulePair> create(CFRunLoopRef runLoop, CFStringRef mode) { return adoptRef(new SchedulePair(runLoop, mode)); }
+
+#if PLATFORM(MAC) && !USE(CFNETWORK)
+    static PassRefPtr<SchedulePair> create(NSRunLoop* runLoop, CFStringRef mode) { return adoptRef(new SchedulePair(runLoop, mode)); }
+    NSRunLoop* nsRunLoop() const { return m_nsRunLoop.get(); }
+#endif
+
+    CFRunLoopRef runLoop() const { return m_runLoop.get(); }
+    CFStringRef mode() const { return m_mode.get(); }
+
+    WTF_EXPORT_PRIVATE bool operator==(const SchedulePair& other) const;
+
+private:
+    SchedulePair(CFRunLoopRef runLoop, CFStringRef mode)
+        : m_runLoop(runLoop)
+    {
+        if (mode)
+            m_mode = adoptCF(CFStringCreateCopy(0, mode));
+    }
+
+#if PLATFORM(MAC) && !USE(CFNETWORK)
+    WTF_EXPORT_PRIVATE SchedulePair(NSRunLoop*, CFStringRef);
+    RetainPtr<NSRunLoop*> m_nsRunLoop;
+#endif
+
+    RetainPtr<CFRunLoopRef> m_runLoop;
+    RetainPtr<CFStringRef> m_mode;
+};
+
+struct SchedulePairHash {
+    static unsigned hash(const RefPtr<SchedulePair>& pair)
+    {
+        uintptr_t hashCodes[2] = { reinterpret_cast<uintptr_t>(pair->runLoop()), pair->mode() ? CFHash(pair->mode()) : 0 };
+        return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
+    }
+
+    static bool equal(const RefPtr<SchedulePair>& a, const RefPtr<SchedulePair>& b) { return a == b; }
+
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+typedef HashSet<RefPtr<SchedulePair>, SchedulePairHash> SchedulePairHashSet;
+
+} // namespace WTF
+
+using WTF::SchedulePair;
+using WTF::SchedulePairHashSet;
+
+#endif