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diff --git a/Source/WebCore/page/ResourceUsageOverlay.h b/Source/WebCore/page/ResourceUsageOverlay.h
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+++ b/Source/WebCore/page/ResourceUsageOverlay.h
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+/*
+ * Copyright (C) 2015 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 "FloatRect.h"
+#include "GraphicsLayer.h"
+#include "IntRect.h"
+#include "MainFrame.h"
+#include "PageOverlay.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/RetainPtr.h>
+
+#if PLATFORM(COCOA)
+#include "PlatformCALayer.h"
+#endif
+
+namespace WebCore {
+
+class FloatRect;
+class IntPoint;
+class IntRect;
+
+class ResourceUsageOverlay final : public PageOverlay::Client {
+    WTF_MAKE_FAST_ALLOCATED;
+    WTF_MAKE_NONCOPYABLE(ResourceUsageOverlay);
+public:
+    explicit ResourceUsageOverlay(Page&);
+    ~ResourceUsageOverlay();
+
+    PageOverlay& overlay() { return *m_overlay; }
+
+#if PLATFORM(COCOA)
+    void platformDraw(CGContextRef);
+#endif
+
+    static const int normalWidth = 570;
+    static const int normalHeight = 160;
+
+private:
+    void willMoveToPage(PageOverlay&, Page*) override { }
+    void didMoveToPage(PageOverlay&, Page*) override { }
+    void drawRect(PageOverlay&, GraphicsContext&, const IntRect&) override { }
+    bool mouseEvent(PageOverlay&, const PlatformMouseEvent&) override;
+    void didScrollFrame(PageOverlay&, Frame&) override { }
+
+    void initialize();
+
+    void platformInitialize();
+    void platformDestroy();
+
+    Page& m_page;
+    RefPtr<PageOverlay> m_overlay;
+    bool m_dragging { false };
+    IntPoint m_dragPoint;
+
+#if PLATFORM(COCOA)
+    ThreadIdentifier m_threadID { 0 };
+    RetainPtr<CALayer> m_layer;
+    RetainPtr<CALayer> m_containerLayer;
+#endif
+
+#if OS(LINUX)
+    std::unique_ptr<GraphicsLayer> m_paintLayer;
+    std::unique_ptr<GraphicsLayerClient> m_overlayPainter;
+#endif
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(RESOURCE_USAGE)