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diff --git a/Source/WebKit2/UIProcess/BackingStore.h b/Source/WebKit2/UIProcess/BackingStore.h
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+++ b/Source/WebKit2/UIProcess/BackingStore.h
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+/*
+ * Copyright (C) 2011 Apple 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 BackingStore_h
+#define BackingStore_h
+
+#include <WebCore/IntSize.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/PassOwnPtr.h>
+
+#if PLATFORM(MAC)
+#include <wtf/RetainPtr.h>
+#elif PLATFORM(WIN) || PLATFORM(WIN_CAIRO)
+#include <wtf/OwnPtr.h>
+#endif
+
+#if PLATFORM(QT)
+#include <QtGui/QPainter>
+#include <QtGui/QPixmap>
+#endif
+
+#if USE(CAIRO) && !PLATFORM(WIN_CAIRO)
+#include <RefPtrCairo.h>
+#include <WebCore/WidgetBackingStore.h>
+#endif
+
+namespace WebCore {
+    class IntRect;
+}
+
+namespace WebKit {
+
+class ShareableBitmap;
+class UpdateInfo;
+class WebPageProxy;
+
+class BackingStore {
+    WTF_MAKE_NONCOPYABLE(BackingStore);
+
+public:
+    static PassOwnPtr<BackingStore> create(const WebCore::IntSize&, float deviceScaleFactor, WebPageProxy*);
+    ~BackingStore();
+
+    const WebCore::IntSize& size() const { return m_size; }
+    float deviceScaleFactor() const { return m_deviceScaleFactor; }
+
+#if PLATFORM(MAC)
+    typedef CGContextRef PlatformGraphicsContext;
+#elif PLATFORM(WIN)
+    typedef HDC PlatformGraphicsContext;
+#elif PLATFORM(QT)
+    typedef QPainter* PlatformGraphicsContext;
+#elif USE(CAIRO)
+    typedef cairo_t* PlatformGraphicsContext;
+#endif
+
+    void paint(PlatformGraphicsContext, const WebCore::IntRect&);
+    void incorporateUpdate(const UpdateInfo&);
+
+private:
+    BackingStore(const WebCore::IntSize&, float deviceScaleFactor, WebPageProxy*);
+
+    void incorporateUpdate(ShareableBitmap*, const UpdateInfo&);
+    void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
+
+    WebCore::IntSize m_size;
+    float m_deviceScaleFactor;
+    WebPageProxy* m_webPageProxy;
+
+#if PLATFORM(MAC)
+    CGContextRef backingStoreContext();
+
+    RetainPtr<CGLayerRef> m_cgLayer;
+    RetainPtr<CGContextRef> m_bitmapContext;
+#elif PLATFORM(WIN) || PLATFORM(WIN_CAIRO)
+    OwnPtr<HBITMAP> m_bitmap;
+#elif PLATFORM(QT)
+    QPixmap m_pixmap;
+#elif USE(CAIRO)
+    OwnPtr<WebCore::WidgetBackingStore> m_backingStore;
+#endif
+};
+
+} // namespace WebKit
+
+#endif // BackingStore_h