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diff --git a/chromium/third_party/WebKit/Source/core/platform/chromium/ScrollbarThemeChromiumOverlay.h b/chromium/third_party/WebKit/Source/core/platform/chromium/ScrollbarThemeChromiumOverlay.h
new file mode 100644
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+++ b/chromium/third_party/WebKit/Source/core/platform/chromium/ScrollbarThemeChromiumOverlay.h
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+/*
+ * Copyright (C) 2011 Google 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 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 ScrollbarThemeChromiumOverlay_h
+#define ScrollbarThemeChromiumOverlay_h
+
+#include "core/platform/ScrollbarTheme.h"
+
+namespace WebCore {
+
+// This scrollbar theme is used to get overlay scrollbar for platforms other
+// than Mac. Mac's overlay scrollbars are in ScrollbarThemeMac*.
+class ScrollbarThemeChromiumOverlay : public ScrollbarTheme {
+public:
+    virtual int scrollbarThickness(ScrollbarControlSize) OVERRIDE;
+    virtual bool usesOverlayScrollbars() const OVERRIDE;
+
+    virtual int thumbPosition(ScrollbarThemeClient*) OVERRIDE;
+    virtual int thumbLength(ScrollbarThemeClient*) OVERRIDE;
+
+    virtual bool hasButtons(ScrollbarThemeClient*) OVERRIDE { return false; };
+    virtual bool hasThumb(ScrollbarThemeClient*) OVERRIDE;
+
+    virtual IntRect backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) OVERRIDE;
+    virtual IntRect forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) OVERRIDE;
+    virtual IntRect trackRect(ScrollbarThemeClient*, bool painting = false) OVERRIDE;
+
+    virtual void paintThumb(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) OVERRIDE;
+};
+
+} // namespace WebCore
+
+#endif