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diff --git a/content/shell/renderer/test_runner/WebTestThemeEngineMac.h b/content/shell/renderer/test_runner/WebTestThemeEngineMac.h
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+++ b/content/shell/renderer/test_runner/WebTestThemeEngineMac.h
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// 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 WebTestThemeEngineMac_h
+#define WebTestThemeEngineMac_h
+
+#include "third_party/WebKit/public/platform/WebNonCopyable.h"
+#include "third_party/WebKit/public/platform/mac/WebThemeEngine.h"
+
+namespace WebTestRunner {
+
+class WebTestThemeEngineMac : public blink::WebThemeEngine, public blink::WebNonCopyable {
+public:
+    virtual ~WebTestThemeEngineMac() { }
+
+    virtual void paintScrollbarThumb(
+        blink::WebCanvas*,
+        blink::WebThemeEngine::State,
+        blink::WebThemeEngine::Size,
+        const blink::WebRect&,
+        const blink::WebThemeEngine::ScrollbarInfo&);
+
+private:
+    virtual void paintHIThemeScrollbarThumb(
+        blink::WebCanvas*,
+        blink::WebThemeEngine::State,
+        blink::WebThemeEngine::Size,
+        const blink::WebRect&,
+        const blink::WebThemeEngine::ScrollbarInfo&);
+    virtual void paintNSScrollerScrollbarThumb(
+        blink::WebCanvas*,
+        blink::WebThemeEngine::State,
+        blink::WebThemeEngine::Size,
+        const blink::WebRect&,
+        const blink::WebThemeEngine::ScrollbarInfo&);
+};
+
+}
+
+#endif // WebTestThemeEngineMac_h