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diff --git a/Source/WebCore/page/ResourceUsageThread.h b/Source/WebCore/page/ResourceUsageThread.h
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+++ b/Source/WebCore/page/ResourceUsageThread.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. 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.
+ */
+
+#pragma once
+
+#if ENABLE(RESOURCE_USAGE)
+
+#include "ResourceUsageData.h"
+#include <array>
+#include <functional>
+#include <wtf/Condition.h>
+#include <wtf/HashMap.h>
+#include <wtf/Lock.h>
+#include <wtf/NeverDestroyed.h>
+#include <wtf/Noncopyable.h>
+
+namespace JSC {
+class VM;
+}
+
+namespace WebCore {
+
+class ResourceUsageThread {
+    WTF_MAKE_NONCOPYABLE(ResourceUsageThread);
+
+public:
+    static void addObserver(void* key, std::function<void (const ResourceUsageData&)>);
+    static void removeObserver(void* key);
+
+private:
+    friend NeverDestroyed<ResourceUsageThread>;
+    ResourceUsageThread();
+    static ResourceUsageThread& singleton();
+
+    void waitUntilObservers();
+    void notifyObservers(ResourceUsageData&&);
+
+    void createThreadIfNeeded();
+    static void threadCallback(void* scrollingThread);
+    void threadBody();
+    void platformThreadBody(JSC::VM*, ResourceUsageData&);
+
+    ThreadIdentifier m_threadIdentifier { 0 };
+    Lock m_lock;
+    Condition m_condition;
+    HashMap<void*, std::function<void (const ResourceUsageData&)>> m_observers;
+
+    // Platforms may need to access some data from the common VM.
+    // They should ensure their use of the VM is thread safe.
+    JSC::VM* m_vm { nullptr };
+};
+
+#if PLATFORM(COCOA)
+struct TagInfo {
+    TagInfo() { }
+    size_t dirty { 0 };
+    size_t reclaimable { 0 };
+};
+
+const char* displayNameForVMTag(unsigned);
+size_t vmPageSize();
+std::array<TagInfo, 256> pagesPerVMTag();
+void logFootprintComparison(const std::array<TagInfo, 256>&, const std::array<TagInfo, 256>&);
+#endif
+
+} // namespace WebCore
+
+#endif // ENABLE(RESOURCE_USAGE)