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diff --git a/dom/media/webaudio/blink/ReverbInputBuffer.h b/dom/media/webaudio/blink/ReverbInputBuffer.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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 ReverbInputBuffer_h
+#define ReverbInputBuffer_h
+
+#include "nsTArray.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/MemoryReporting.h"
+
+namespace WebCore {
+
+// ReverbInputBuffer is used to buffer input samples for deferred processing by
+// the background threads.
+class ReverbInputBuffer {
+ public:
+  explicit ReverbInputBuffer(size_t length);
+
+  // The realtime audio thread keeps writing samples here.
+  // The assumption is that the buffer's length is evenly divisible by
+  // numberOfFrames (for nearly all cases this will be fine).
+  // FIXME: remove numberOfFrames restriction...
+  void write(const float* sourceP, size_t numberOfFrames);
+
+  // Background threads can call this to check if there's anything to read...
+  size_t writeIndex() const { return m_writeIndex; }
+
+  // The individual background threads read here (and hope that they can keep up
+  // with the buffer writing). readIndex is updated with the next readIndex to
+  // read from... The assumption is that the buffer's length is evenly divisible
+  // by numberOfFrames.
+  // FIXME: remove numberOfFrames restriction...
+  float* directReadFrom(int* readIndex, size_t numberOfFrames);
+
+  void reset();
+
+  size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
+    return m_buffer.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  }
+
+ private:
+  nsTArray<float> m_buffer;
+  mozilla::Atomic<size_t, mozilla::ReleaseAcquire> m_writeIndex;
+};
+
+}  // namespace WebCore
+
+#endif  // ReverbInputBuffer_h