Initial import attempt, just to play with. Many things disabled/removed

ui/cc/ScrollbarLayerChromium.h

Index: ui/cc/ScrollbarLayerChromium.h
diff --git a/ui/cc/ScrollbarLayerChromium.h b/ui/cc/ScrollbarLayerChromium.h
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+++ b/ui/cc/ScrollbarLayerChromium.h
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+/*
+ * Copyright (C) 2012 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. 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 INC. 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 ScrollbarLayerChromium_h
+#define ScrollbarLayerChromium_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "LayerChromium.h"
+#include "LayerTextureUpdater.h"
+#include "ScrollTypes.h"
+
+namespace WebCore {
+
+class Scrollbar;
+class ScrollbarThemeComposite;
+class CCTextureUpdater;
+
+class ScrollbarLayerChromium : public LayerChromium {
+public:
+    virtual PassOwnPtr<CCLayerImpl> createCCLayerImpl();
+    static PassRefPtr<ScrollbarLayerChromium> create(Scrollbar*, int scrollLayerId);
+
+    // LayerChromium interface
+    virtual void update(CCTextureUpdater&, const CCOcclusionTracker*) OVERRIDE;
+    virtual void setLayerTreeHost(CCLayerTreeHost*) OVERRIDE;
+    virtual void pushPropertiesTo(CCLayerImpl*) OVERRIDE;
+
+    int scrollLayerId() const { return m_scrollLayerId; }
+    void setScrollLayerId(int id) { m_scrollLayerId = id; }
+
+    virtual ScrollbarLayerChromium* toScrollbarLayerChromium() { return this; }
+
+protected:
+    ScrollbarLayerChromium(Scrollbar*, int scrollLayerId);
+
+private:
+    ScrollbarThemeComposite* theme() const;
+    void updatePart(LayerTextureUpdater*, LayerTextureUpdater::Texture*, const IntRect&, CCTextureUpdater&);
+    void createTextureUpdaterIfNeeded();
+
+    RefPtr<Scrollbar> m_scrollbar;
+    int m_scrollLayerId;
+
+    GC3Denum m_textureFormat;
+
+    RefPtr<LayerTextureUpdater> m_backTrackUpdater;
+    RefPtr<LayerTextureUpdater> m_foreTrackUpdater;
+    RefPtr<LayerTextureUpdater> m_thumbUpdater;
+
+    // All the parts of the scrollbar except the thumb
+    OwnPtr<LayerTextureUpdater::Texture> m_backTrack;
+    OwnPtr<LayerTextureUpdater::Texture> m_foreTrack;
+    OwnPtr<LayerTextureUpdater::Texture> m_thumb;
+
+    ScrollbarOverlayStyle m_scrollbarOverlayStyle;
+    bool m_isScrollableAreaActive;
+    bool m_isScrollViewScrollbar;
+
+    ScrollbarOrientation m_orientation;
+
+    ScrollbarControlSize m_controlSize;
+};
+
+}
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif