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diff --git a/dom/media/gmp/gmp-api/gmp-video-frame-i420.h b/dom/media/gmp/gmp-api/gmp-video-frame-i420.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** 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.
+ *
+ ** Neither the name of Google 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * HOLDER OR 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 GMP_VIDEO_FRAME_I420_h_
+#define GMP_VIDEO_FRAME_I420_h_
+
+#include "gmp-errors.h"
+#include "gmp-video-frame.h"
+#include "gmp-video-plane.h"
+
+#include <stdint.h>
+
+enum GMPPlaneType {
+  kGMPYPlane = 0,
+  kGMPUPlane = 1,
+  kGMPVPlane = 2,
+  kGMPNumOfPlanes = 3
+};
+
+// The implementation backing this interface uses shared memory for the
+// buffer(s). This means it can only be used by the "owning" process.
+// At first the process which created the object owns it. When the object
+// is passed to an interface the creator loses ownership and must Destroy()
+// the object. Further attempts to use it may fail due to not being able to
+// access the underlying buffer(s).
+//
+// Methods that create or destroy shared memory must be called on the main
+// thread. They are marked below.
+class GMPVideoi420Frame : public GMPVideoFrame {
+ public:
+  // MAIN THREAD ONLY
+  // CreateEmptyFrame: Sets frame dimensions and allocates buffers based
+  // on set dimensions - height and plane stride.
+  // If required size is bigger than the allocated one, new buffers of adequate
+  // size will be allocated.
+  virtual GMPErr CreateEmptyFrame(int32_t aWidth, int32_t aHeight,
+                                  int32_t aStride_y, int32_t aStride_u,
+                                  int32_t aStride_v) = 0;
+
+  // MAIN THREAD ONLY
+  // CreateFrame: Sets the frame's members and buffers. If required size is
+  // bigger than allocated one, new buffers of adequate size will be allocated.
+  virtual GMPErr CreateFrame(int32_t aSize_y, const uint8_t* aBuffer_y,
+                             int32_t aSize_u, const uint8_t* aBuffer_u,
+                             int32_t aSize_v, const uint8_t* aBuffer_v,
+                             int32_t aWidth, int32_t aHeight, int32_t aStride_y,
+                             int32_t aStride_u, int32_t aStride_v) = 0;
+
+  // MAIN THREAD ONLY
+  // Copy frame: If required size is bigger than allocated one, new buffers of
+  // adequate size will be allocated.
+  virtual GMPErr CopyFrame(const GMPVideoi420Frame& aVideoFrame) = 0;
+
+  // Swap Frame.
+  virtual void SwapFrame(GMPVideoi420Frame* aVideoFrame) = 0;
+
+  // Get pointer to buffer per plane.
+  virtual uint8_t* Buffer(GMPPlaneType aType) = 0;
+
+  // Overloading with const.
+  virtual const uint8_t* Buffer(GMPPlaneType aType) const = 0;
+
+  // Get allocated size per plane.
+  virtual int32_t AllocatedSize(GMPPlaneType aType) const = 0;
+
+  // Get allocated stride per plane.
+  virtual int32_t Stride(GMPPlaneType aType) const = 0;
+
+  // Set frame width.
+  virtual GMPErr SetWidth(int32_t aWidth) = 0;
+
+  // Set frame height.
+  virtual GMPErr SetHeight(int32_t aHeight) = 0;
+
+  // Get frame width.
+  virtual int32_t Width() const = 0;
+
+  // Get frame height.
+  virtual int32_t Height() const = 0;
+
+  // Set frame timestamp (microseconds)
+  virtual void SetTimestamp(uint64_t aTimestamp) = 0;
+
+  // Get frame timestamp (microseconds)
+  virtual uint64_t Timestamp() const = 0;
+
+  // Set frame duration (microseconds)
+  // NOTE: next-frame's Timestamp() != this-frame's TimeStamp()+Duration()
+  // depending on rounding to avoid having to track roundoff errors
+  // and dropped/missing frames(!) (which may leave a large gap)
+  virtual void SetDuration(uint64_t aDuration) = 0;
+
+  // Get frame duration (microseconds)
+  virtual uint64_t Duration() const = 0;
+
+  // Return true if underlying plane buffers are of zero size, false if not.
+  virtual bool IsZeroSize() const = 0;
+
+  // Reset underlying plane buffers sizes to 0. This function doesn't clear
+  // memory.
+  virtual void ResetSize() = 0;
+
+  // -- These methods have been added in kGMPVersion34 --
+
+  // Set an updated frame timestamp (microseconds) from decoder
+  virtual void SetUpdatedTimestamp(uint64_t aTimestamp) = 0;
+
+  // Get an updated frame timestamp (microseconds) from decoder
+  virtual uint64_t UpdatedTimestamp() const = 0;
+};
+
+#endif  // GMP_VIDEO_FRAME_I420_h_