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diff --git a/WebCore/platform/audio/chromium/AudioBusChromium.cpp b/WebCore/platform/audio/chromium/AudioBusChromium.cpp
new file mode 100644
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+++ b/WebCore/platform/audio/chromium/AudioBusChromium.cpp
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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.
+ */
+
+#include "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#include "AudioBus.h"
+
+#include "AudioFileReader.h"
+#include "ChromiumBridge.h"
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+// We will use this version of loadPlatformResource() once the resources are checked into Chromium.
+
+// PassOwnPtr<AudioBus> AudioBus::loadPlatformResource(const char* name, double sampleRate)
+// {
+//     return ChromiumBridge::loadPlatformAudioResource(name, sampleRate);
+// }
+
+PassOwnPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, double sampleRate)
+{
+    OwnPtr<AudioBus> audioBus = ChromiumBridge::decodeAudioFileData(static_cast<const char*>(data), dataSize, sampleRate);
+    if (audioBus->numberOfChannels() == 2 && mixToMono) {
+        OwnPtr<AudioBus> monoAudioBus = adoptPtr(new AudioBus(1, audioBus->length()));
+
+        // FIXME: AudioBus::copyFrom() should be able to do a downmix to mono.
+        // for now simply copy the left channel.
+        monoAudioBus->channel(0)->copyFrom(audioBus->channel(0));
+        return monoAudioBus.release();
+    }
+    
+    return audioBus.release();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)