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diff --git a/WebKit/chromium/public/WebAudioBus.h b/WebKit/chromium/public/WebAudioBus.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:
+ * 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 WebAudioBus_h
+#define WebAudioBus_h
+
+#include "WebCommon.h"
+
+#if WEBKIT_IMPLEMENTATION
+namespace WebCore { class AudioBus; }
+namespace WTF { template <typename T> class PassOwnPtr; }
+#endif
+
+namespace WebKit {
+
+class WebAudioBusPrivate;
+
+// A container for multi-channel linear PCM audio data.
+//
+// WARNING: It is not safe to pass a WebAudioBus across threads!!!
+//
+class WebAudioBus {
+public:
+    WebAudioBus() : m_private(0) { }
+    ~WebAudioBus();
+    
+    // initialize() allocates memory of the given length for the given number of channels.
+    void initialize(unsigned numberOfChannels, size_t length, double sampleRate);
+
+    WEBKIT_API unsigned numberOfChannels() const;
+    WEBKIT_API size_t length() const;
+    WEBKIT_API double sampleRate() const;
+    
+    WEBKIT_API float* channelData(unsigned channelIndex);
+
+#if WEBKIT_IMPLEMENTATION
+    WTF::PassOwnPtr<WebCore::AudioBus> release();    
+#endif
+
+private:
+    // Noncopyable
+    WebAudioBus(const WebAudioBus& d) : m_private(0) { }
+    WebAudioBusPrivate* m_private;
+};
+
+} // namespace WebKit
+
+#endif // WebAudioBus_h