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diff --git a/Tools/DumpRenderTree/chromium/WebThemeEngineDRTMac.h b/Tools/DumpRenderTree/chromium/WebThemeEngineDRTMac.h
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+++ b/Tools/DumpRenderTree/chromium/WebThemeEngineDRTMac.h
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+/*
+ * Copyright (C) 2010 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 INC. ``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
+ * 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.
+ */
+
+// This implements the WebThemeEngine API in such a way that we match the Mac
+// port rendering more than usual Chromium path, thus allowing us to share
+// more pixel baselines.
+
+#ifndef WebThemeEngineDRTMac_h
+#define WebThemeEngineDRTMac_h
+
+#include "third_party/WebKit/WebKit/chromium/public/mac/WebThemeEngine.h"
+
+class WebThemeEngineDRTMac : public WebKit::WebThemeEngine {
+public:
+    virtual void paintScrollbarThumb(
+        WebKit::WebCanvas*,
+        WebKit::WebThemeEngine::State,
+        WebKit::WebThemeEngine::Size,
+        const WebKit::WebRect&,
+        const WebKit::WebThemeEngine::ScrollbarInfo&);
+private:
+    virtual void paintHIThemeScrollbarThumb(
+        WebKit::WebCanvas*,
+        WebKit::WebThemeEngine::State,
+        WebKit::WebThemeEngine::Size,
+        const WebKit::WebRect&,
+        const WebKit::WebThemeEngine::ScrollbarInfo&);
+    virtual void paintNSScrollerScrollbarThumb(
+        WebKit::WebCanvas*,
+        WebKit::WebThemeEngine::State,
+        WebKit::WebThemeEngine::Size,
+        const WebKit::WebRect&,
+        const WebKit::WebThemeEngine::ScrollbarInfo&);
+};
+
+#endif // WebThemeEngineDRTMac_h