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diff --git a/Source/WebCore/html/canvas/WebGLBuffer.h b/Source/WebCore/html/canvas/WebGLBuffer.h
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+++ b/Source/WebCore/html/canvas/WebGLBuffer.h
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+/*
+ * Copyright (C) 2009 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 WebGLBuffer_h
+#define WebGLBuffer_h
+
+#include "ArrayBuffer.h"
+#include "WebGLObject.h"
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+class ArrayBufferView;
+
+class WebGLBuffer : public WebGLObject {
+public:
+    virtual ~WebGLBuffer() { deleteObject(); }
+
+    static PassRefPtr<WebGLBuffer> create(WebGLRenderingContext*);
+
+    bool associateBufferData(int size);
+    bool associateBufferData(ArrayBuffer* array);
+    bool associateBufferData(ArrayBufferView* array);
+    bool associateBufferSubData(long offset, ArrayBuffer* array);
+    bool associateBufferSubData(long offset, ArrayBufferView* array);
+
+    unsigned byteLength() const;
+    const ArrayBuffer* elementArrayBuffer() const { return m_elementArrayBuffer.get(); }
+
+    // Gets the cached max index for the given type. Returns -1 if
+    // none has been set.
+    long getCachedMaxIndex(unsigned long type);
+    // Sets the cached max index for the given type.
+    void setCachedMaxIndex(unsigned long type, long value);
+
+    unsigned long getTarget() const { return m_target; }
+    void setTarget(unsigned long);
+
+    bool hasEverBeenBound() const { return object() && m_target; }
+
+protected:
+    WebGLBuffer(WebGLRenderingContext*);
+
+    virtual void deleteObjectImpl(Platform3DObject o);
+
+private:
+    virtual bool isBuffer() const { return true; }
+
+    unsigned long m_target;
+
+    RefPtr<ArrayBuffer> m_elementArrayBuffer;
+    unsigned m_byteLength;
+
+    // Optimization for index validation. For each type of index
+    // (i.e., UNSIGNED_SHORT), cache the maximum index in the
+    // entire buffer.
+    //
+    // This is sufficient to eliminate a lot of work upon each
+    // draw call as long as all bound array buffers are at least
+    // that size.
+    struct MaxIndexCacheEntry {
+        unsigned long type;
+        long maxIndex;
+    };
+    // OpenGL ES 2.0 only has two valid index types (UNSIGNED_BYTE
+    // and UNSIGNED_SHORT), but might as well leave open the
+    // possibility of adding others.
+    MaxIndexCacheEntry m_maxIndexCache[4];
+    unsigned m_nextAvailableCacheEntry;
+
+    // Clears all of the cached max indices.
+    void clearCachedMaxIndices();
+
+    // Helper function called by the three associateBufferData().
+    bool associateBufferDataImpl(ArrayBuffer* array, unsigned byteOffset, unsigned byteLength);
+    // Helper function called by the two associateBufferSubData().
+    bool associateBufferSubDataImpl(long offset, ArrayBuffer* array, unsigned arrayByteOffset, unsigned byteLength);
+};
+
+} // namespace WebCore
+
+#endif // WebGLBuffer_h