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diff --git a/Source/JavaScriptCore/heap/GCActivityCallback.h b/Source/JavaScriptCore/heap/GCActivityCallback.h
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+++ b/Source/JavaScriptCore/heap/GCActivityCallback.h
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+/*
+ * Copyright (C) 2010 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 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 GCActivityCallback_h
+#define GCActivityCallback_h
+
+#include "HeapTimer.h"
+#include <wtf/RefPtr.h>
+
+#if USE(CF)
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
+namespace JSC {
+
+class FullGCActivityCallback;
+class Heap;
+
+class JS_EXPORT_PRIVATE GCActivityCallback : public HeapTimer, public ThreadSafeRefCounted<GCActivityCallback> {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static RefPtr<FullGCActivityCallback> createFullTimer(Heap*);
+    static RefPtr<GCActivityCallback> createEdenTimer(Heap*);
+
+    GCActivityCallback(Heap*);
+
+    virtual void doWork() override;
+
+    virtual void doCollection() = 0;
+
+    virtual void didAllocate(size_t);
+    virtual void willCollect();
+    virtual void cancel();
+    bool isEnabled() const { return m_enabled; }
+    void setEnabled(bool enabled) { m_enabled = enabled; }
+
+    static bool s_shouldCreateGCTimer;
+
+#if USE(CF) || PLATFORM(EFL)
+    double nextFireTime() const { return m_nextFireTime; }
+#endif
+
+protected:
+    virtual double lastGCLength() = 0;
+    virtual double gcTimeSlice(size_t bytes) = 0;
+    virtual double deathRate() = 0;
+
+#if USE(CF)
+    GCActivityCallback(VM* vm, CFRunLoopRef runLoop)
+        : HeapTimer(vm, runLoop)
+        , m_enabled(true)
+        , m_delay(s_decade)
+    {
+    }
+#elif PLATFORM(EFL)
+    static constexpr double s_hour = 3600;
+    GCActivityCallback(VM* vm, bool flag)
+        : HeapTimer(vm)
+        , m_enabled(flag)
+        , m_delay(s_hour)
+    {
+    }
+#elif PLATFORM(QT)
+    static constexpr double s_hour = 3600;
+    GCActivityCallback(VM* vm)
+        : HeapTimer(vm)
+        , m_enabled(true)
+        , m_delay(s_hour)
+    {
+    }
+#elif USE(GLIB)
+    GCActivityCallback(VM* vm)
+        : HeapTimer(vm)
+        , m_enabled(true)
+        , m_delay(-1)
+    {
+    }
+#else
+    GCActivityCallback(VM* vm)
+        : HeapTimer(vm)
+        , m_enabled(true)
+    {
+    }
+#endif
+
+    bool m_enabled;
+
+#if USE(CF)
+protected:
+    GCActivityCallback(Heap*, CFRunLoopRef);
+#endif
+#if USE(CF) || USE(GLIB) || PLATFORM(QT)
+protected:
+    void cancelTimer();
+    void scheduleTimer(double);
+
+private:
+    double m_delay;
+    double m_nextFireTime { 0 };
+#endif
+};
+
+} // namespace JSC
+
+#endif