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diff --git a/dom/media/webaudio/blink/ReverbConvolver.h b/dom/media/webaudio/blink/ReverbConvolver.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 ReverbConvolver_h
+#define ReverbConvolver_h
+
+#include "ReverbAccumulationBuffer.h"
+#include "ReverbInputBuffer.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Monitor.h"
+#include "mozilla/UniquePtr.h"
+#ifdef LOG
+#  undef LOG
+#endif
+#include "base/thread.h"
+#include <atomic>
+
+namespace WebCore {
+
+using mozilla::UniquePtr;
+
+class ReverbConvolverStage;
+
+class ReverbConvolver {
+ public:
+  // maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much
+  // precision is necessary. For certain tweaky de-convolving applications the
+  // phase errors add up quickly and lead to non-sensical results with larger
+  // FFT sizes and single-precision floats.  In these cases 2048 is a good size.
+  // If not doing multi-threaded convolution, then should not go > 8192.
+  ReverbConvolver(const float* impulseResponseData,
+                  size_t impulseResponseLength, size_t maxFFTSize,
+                  size_t convolverRenderPhase, bool useBackgroundThreads,
+                  bool* aAllocationFailure);
+  ~ReverbConvolver();
+
+  void process(const float* sourceChannelData, float* destinationChannelData);
+
+  size_t impulseResponseLength() const { return m_impulseResponseLength; }
+
+  ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }
+
+  bool useBackgroundThreads() const { return m_useBackgroundThreads; }
+  void backgroundThreadEntry();
+
+  size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  nsTArray<UniquePtr<ReverbConvolverStage> > m_stages;
+  nsTArray<UniquePtr<ReverbConvolverStage> > m_backgroundStages;
+  size_t m_impulseResponseLength;
+
+  ReverbAccumulationBuffer m_accumulationBuffer;
+
+  // One or more background threads read from this input buffer which is fed
+  // from the realtime thread.
+  ReverbInputBuffer m_inputBuffer;
+
+  // Background thread and synchronization
+  base::Thread m_backgroundThread;
+  mozilla::Monitor m_backgroundThreadMonitor MOZ_UNANNOTATED;
+  bool m_useBackgroundThreads;
+  std::atomic<bool> m_wantsToExit;
+  std::atomic<bool> m_moreInputBuffered;
+};
+
+}  // namespace WebCore
+
+#endif  // ReverbConvolver_h