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diff --git a/dom/media/webaudio/blink/HRTFElevation.h b/dom/media/webaudio/blink/HRTFElevation.h
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+++ 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_elevationAngle(elevation)
+        , m_sampleRate(sampleRate)
+    {
+        m_kernelListL.SwapElements(*kernelListL);
+    }
+
+    // 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