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diff --git a/WebKit/chromium/public/linux/WebThemeEngine.h b/WebKit/chromium/public/linux/WebThemeEngine.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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#ifndef WebThemeEngine_h
+#define WebThemeEngine_h
+
+#include "../WebCanvas.h"
+#include "../WebColor.h"
+#include "../WebSize.h"
+
+namespace WebKit {
+
+struct WebRect;
+
+class WebThemeEngine {
+public:
+    // The UI part which is being accessed.
+    enum Part {
+        PartScrollbarDownArrow,
+        PartScrollbarLeftArrow,
+        PartScrollbarRightArrow,
+        PartScrollbarUpArrow,
+        PartScrollbarHorizontalThumb,
+        PartScrollbarVerticalThumb,
+        PartScrollbarHoriztonalTrack,
+        PartScrollbarVerticalTrack
+    };
+
+    // The current state of the associated Part.
+    enum State {
+        StateDisabled,
+        StateHover,
+        StateNormal,
+        StatePressed,
+    };
+
+    // Extra parameters for drawing the PartScrollbarHoriztonalTrack and
+    // PartScrollbarVerticalTrack.
+    struct ScrollbarTrackExtraParams {
+        // The bounds of the entire track, as opposed to the part being painted.
+        int trackX;
+        int trackY;
+        int trackWidth;
+        int trackHeight;
+    };
+
+    union ExtraParams {
+        ScrollbarTrackExtraParams scrollbarTrack;
+    };
+
+    // Gets the size of the given theme part. For variable sized items
+    // like vertical scrollbar thumbs, the width will be the required width of
+    // the track while the height will be the minimum height.
+    virtual WebSize getSize(Part) { return WebSize(); }
+    // Paint the given the given theme part.
+    virtual void paint(
+        WebCanvas*, Part, State, const WebRect&, const ExtraParams*) {}
+};
+
+} // namespace WebKit
+
+#endif