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diff --git a/Source/WebKit2/Shared/ShareableBitmap.h b/Source/WebKit2/Shared/ShareableBitmap.h
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+++ b/Source/WebKit2/Shared/ShareableBitmap.h
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+/*
+ * Copyright (C) 2010 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 ShareableBitmap_h
+#define ShareableBitmap_h
+
+#include "SharedMemory.h"
+#include <WebCore/IntRect.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+    class GraphicsContext;
+}
+
+namespace WebKit {
+    
+class ShareableBitmap : public RefCounted<ShareableBitmap> {
+public:
+    // Create a shareable bitmap that uses malloced memory.
+    static PassRefPtr<ShareableBitmap> create(const WebCore::IntSize&);
+
+    // Create a shareable bitmap whose backing memory can be shared with another process.
+    static PassRefPtr<ShareableBitmap> createShareable(const WebCore::IntSize&);
+
+    // Create a shareable bitmap from a shared memory handle.
+    static PassRefPtr<ShareableBitmap> create(const WebCore::IntSize&, const SharedMemory::Handle&);
+
+    // Create a shared memory handle.
+    bool createHandle(SharedMemory::Handle&);
+
+    ~ShareableBitmap();
+
+    const WebCore::IntSize& size() const { return m_size; }
+    WebCore::IntRect bounds() const { return WebCore::IntRect(WebCore::IntPoint(), size()); }
+
+    bool resize(const WebCore::IntSize& size);
+
+    // Create a graphics context that can be used to paint into the backing store.
+    PassOwnPtr<WebCore::GraphicsContext> createGraphicsContext();
+
+    // Paint the backing store into the given context.
+    void paint(WebCore::GraphicsContext&, const WebCore::IntPoint& dstPoint, const WebCore::IntRect& srcRect);
+
+    bool isBackedBySharedMemory() const { return m_sharedMemory; }
+
+private:
+    ShareableBitmap(const WebCore::IntSize&, void*);
+    ShareableBitmap(const WebCore::IntSize&, PassRefPtr<SharedMemory>);
+
+    static size_t numBytesForSize(const WebCore::IntSize& size) { return size.width() * size.height() * 4; }
+
+    void* data() const;
+    size_t sizeInBytes() const { return numBytesForSize(m_size); }
+
+    WebCore::IntSize m_size;
+
+    // If the shareable bitmap is backed by shared memory, this points to the shared memory object.
+    RefPtr<SharedMemory> m_sharedMemory;
+
+    // If the shareable bitmap is backed by fastMalloced memory, this points to the data.
+    void* m_data;
+};
+
+} // namespace WebKit
+
+#endif // ShareableBitmap_h