libvpx: Pull from upstream

source/libvpx/third_party/libmkv/WebMElement.h

-// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the LICENSE file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS.  All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-
-
-#ifndef MKV_CONTEXT_HPP
-#define MKV_CONTEXT_HPP 1
-
-// these are helper functions
-void writeHeader(EbmlGlobal *ebml);
-void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc *startInfo,
-                             unsigned long timeCodeScale, double duration);
-// this function is a helper only, it assumes a lot of defaults
-void writeVideoTrack(EbmlGlobal *ebml, unsigned int trackNumber,
-                     int flagLacing, const char *codecId,
-                     unsigned int pixelWidth, unsigned int pixelHeight,
-                     double frameRate);
-void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber,
-                     int flagLacing, const char *codecId,
-                     double samplingFrequency, unsigned int channels,
-                     unsigned char *private, unsigned long privateSize);
-
-void writeSimpleBlock(EbmlGlobal *ebml, unsigned char trackNumber,
-                      short timeCode, int isKeyframe,
-                      unsigned char lacingFlag, int discardable,
-                      unsigned char *data, unsigned long dataLength);
-
-#endif