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diff --git a/Source/WebCore/page/DebugPageOverlays.h b/Source/WebCore/page/DebugPageOverlays.h
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+++ b/Source/WebCore/page/DebugPageOverlays.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.
+ */
+
+#pragma once
+
+#include "Frame.h"
+#include "Settings.h"
+#include <wtf/HashMap.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class MainFrame;
+class RegionOverlay;
+
+class DebugPageOverlays {
+public:
+    static DebugPageOverlays& singleton();
+
+    enum class RegionType {
+        WheelEventHandlers,
+        NonFastScrollableRegion,
+    };
+    static const unsigned NumberOfRegionTypes = NonFastScrollableRegion + 1;
+
+    static void didLayout(Frame&);
+    static void didChangeEventHandlers(Frame&);
+
+    WEBCORE_EXPORT static void settingsChanged(MainFrame&);
+
+private:
+    static bool hasOverlays(MainFrame&);
+
+    void showRegionOverlay(MainFrame&, RegionType);
+    void hideRegionOverlay(MainFrame&, RegionType);
+
+    void regionChanged(Frame&, RegionType);
+
+    bool hasOverlaysForFrame(MainFrame& frame) const
+    {
+        return m_frameRegionOverlays.contains(&frame);
+    }
+    
+    void updateOverlayRegionVisibility(MainFrame&, DebugOverlayRegions);
+
+    RegionOverlay* regionOverlayForFrame(MainFrame&, RegionType) const;
+    RegionOverlay& ensureRegionOverlayForFrame(MainFrame&, RegionType);
+
+    HashMap<MainFrame*, Vector<RefPtr<RegionOverlay>>> m_frameRegionOverlays;
+
+    static DebugPageOverlays* sharedDebugOverlays;
+};
+
+#define FAST_RETURN_IF_NO_OVERLAYS(frame) if (LIKELY(!hasOverlays(frame))) return;
+
+inline bool DebugPageOverlays::hasOverlays(MainFrame& frame)
+{
+    if (!sharedDebugOverlays)
+        return false;
+
+    return sharedDebugOverlays->hasOverlaysForFrame(frame);
+}
+
+inline void DebugPageOverlays::didLayout(Frame& frame)
+{
+    FAST_RETURN_IF_NO_OVERLAYS(frame.mainFrame());
+
+    sharedDebugOverlays->regionChanged(frame, RegionType::WheelEventHandlers);
+    sharedDebugOverlays->regionChanged(frame, RegionType::NonFastScrollableRegion);
+}
+
+inline void DebugPageOverlays::didChangeEventHandlers(Frame& frame)
+{
+    FAST_RETURN_IF_NO_OVERLAYS(frame.mainFrame());
+
+    sharedDebugOverlays->regionChanged(frame, RegionType::WheelEventHandlers);
+    sharedDebugOverlays->regionChanged(frame, RegionType::NonFastScrollableRegion);
+}
+
+} // namespace WebCore