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diff --git a/Source/JavaScriptCore/heap/FullGCActivityCallback.h b/Source/JavaScriptCore/heap/FullGCActivityCallback.h
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+++ b/Source/JavaScriptCore/heap/FullGCActivityCallback.h
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+/*
+ * Copyright (C) 2014 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. 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 INC. 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 FullGCActivityCallback_h
+#define FullGCActivityCallback_h
+
+#include "GCActivityCallback.h"
+
+namespace JSC {
+
+class JS_EXPORT_PRIVATE FullGCActivityCallback : public GCActivityCallback {
+public:
+    FullGCActivityCallback(Heap*);
+
+    virtual void doCollection() override;
+
+    bool didSyncGCRecently() const { return m_didSyncGCRecently; }
+    void setDidSyncGCRecently() { m_didSyncGCRecently = true; }
+
+protected:
+#if USE(CF)
+    FullGCActivityCallback(Heap* heap, CFRunLoopRef runLoop)
+        : GCActivityCallback(heap, runLoop)
+    {
+    }
+#endif
+
+    virtual double lastGCLength() override;
+    virtual double gcTimeSlice(size_t bytes) override;
+    virtual double deathRate() override;
+
+    bool m_didSyncGCRecently { false };
+};
+
+inline RefPtr<FullGCActivityCallback> GCActivityCallback::createFullTimer(Heap* heap)
+{
+    return s_shouldCreateGCTimer ? adoptRef(new FullGCActivityCallback(heap)) : nullptr;
+}
+
+} // namespace JSC
+
+#endif // FullGCActivityCallback_h