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diff --git a/components/html_viewer/web_theme_engine_impl.h b/components/html_viewer/web_theme_engine_impl.h
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+// Copyright 2014 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.
+
+#ifndef COMPONENTS_HTML_VIEWER_WEB_THEME_ENGINE_IMPL_H_
+#define COMPONENTS_HTML_VIEWER_WEB_THEME_ENGINE_IMPL_H_
+
+#include "third_party/WebKit/public/platform/WebThemeEngine.h"
+
+namespace html_viewer {
+
+class WebThemeEngineImpl : public blink::WebThemeEngine {
+ public:
+  // WebThemeEngine methods:
+  virtual blink::WebSize getSize(blink::WebThemeEngine::Part);
+  virtual void paint(blink::WebCanvas* canvas,
+                     blink::WebThemeEngine::Part part,
+                     blink::WebThemeEngine::State state,
+                     const blink::WebRect& rect,
+                     const blink::WebThemeEngine::ExtraParams* extra_params);
+  virtual void paintStateTransition(blink::WebCanvas* canvas,
+                                    blink::WebThemeEngine::Part part,
+                                    blink::WebThemeEngine::State startState,
+                                    blink::WebThemeEngine::State endState,
+                                    double progress,
+                                    const blink::WebRect& rect);
+};
+
+}  // namespace html_viewer
+
+#endif  // COMPONENTS_HTML_VIEWER_WEB_THEME_ENGINE_IMPL_H_