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diff --git a/dom/media/webaudio/blink/HRTFElevation.h b/dom/media/webaudio/blink/HRTFElevation.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 HRTFElevation_h
+#define HRTFElevation_h
+
+#include "HRTFKernel.h"
+#include "nsAutoRef.h"
+#include "mozilla/MemoryReporting.h"
+
+struct SpeexResamplerState_;
+typedef struct SpeexResamplerState_ SpeexResamplerState;
+
+namespace WebCore {
+
+// HRTFElevation contains all of the HRTFKernels (one left ear and one right ear
+// per azimuth angle) for a particular elevation.
+
+class HRTFElevation {
+ public:
+  // Loads and returns an HRTFElevation with the given HRTF database subject
+  // name and elevation from browser (or WebKit.framework) resources. Normally,
+  // there will only be a single HRTF database set, but this API supports the
+  // possibility of multiple ones with different names. Interpolated azimuths
+  // will be generated based on InterpolationFactor. Valid values for elevation
+  // are -45 -> +90 in 15 degree increments.
+  static nsReturnRef<HRTFElevation> createBuiltin(int elevation,
+                                                  float sampleRate);
+
+  // Given two HRTFElevations, and an interpolation factor x: 0 -> 1, returns an
+  // interpolated HRTFElevation.
+  static nsReturnRef<HRTFElevation> createByInterpolatingSlices(
+      HRTFElevation* hrtfElevation1, HRTFElevation* hrtfElevation2, float x,
+      float sampleRate);
+
+  double elevationAngle() const { return m_elevationAngle; }
+  unsigned numberOfAzimuths() const { return NumberOfTotalAzimuths; }
+  float sampleRate() const { return m_sampleRate; }
+
+  // Returns the left and right kernels for the given azimuth index.
+  // The interpolated delays based on azimuthBlend: 0 -> 1 are returned in
+  // frameDelayL and frameDelayR.
+  void getKernelsFromAzimuth(double azimuthBlend, unsigned azimuthIndex,
+                             HRTFKernel*& kernelL, HRTFKernel*& kernelR,
+                             double& frameDelayL, double& frameDelayR);
+
+  // Total number of azimuths after interpolation.
+  static const unsigned NumberOfTotalAzimuths;
+
+  static size_t fftSizeForSampleRate(float sampleRate);
+
+  size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  HRTFElevation(const HRTFElevation& other) = delete;
+  void operator=(const HRTFElevation& other) = delete;
+
+  HRTFElevation(HRTFKernelList&& kernelListL, int elevation, float sampleRate)
+      : m_kernelListL(std::move(kernelListL)),
+        m_elevationAngle(elevation),
+        m_sampleRate(sampleRate) {}
+
+  // Returns the list of left ear HRTFKernels for all the azimuths going from 0
+  // to 360 degrees.
+  const HRTFKernelList& kernelListL() { return m_kernelListL; }
+
+  // Given a specific azimuth and elevation angle, returns the left HRTFKernel.
+  // Values for azimuth must be multiples of 15 in 0 -> 345,
+  // but not all azimuths are available for elevations > +45.
+  // Valid values for elevation are -45 -> +90 in 15 degree increments.
+  static nsReturnRef<HRTFKernel> calculateKernelForAzimuthElevation(
+      int azimuth, int elevation, SpeexResamplerState* resampler,
+      float sampleRate);
+
+  HRTFKernelList m_kernelListL;
+  double m_elevationAngle;
+  float m_sampleRate;
+};
+
+}  // namespace WebCore
+
+template <>
+class nsAutoRefTraits<WebCore::HRTFElevation>
+    : public nsPointerRefTraits<WebCore::HRTFElevation> {
+ public:
+  static void Release(WebCore::HRTFElevation* ptr) { delete (ptr); }
+};
+
+#endif  // HRTFElevation_h