libvpx: Pull from upstream

source/libvpx/webmdec.h

Index: source/libvpx/webmdec.h
===================================================================
--- source/libvpx/webmdec.h	(revision 0)
+++ source/libvpx/webmdec.h	(revision 0)
@@ -0,0 +1,40 @@
+/*
+ *  Copyright (c) 2013 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 WEBMDEC_H_
+#define WEBMDEC_H_
+
+#include "./tools_common.h"
+
+struct nestegg;
+struct nestegg_packet;
+struct VpxInputContext;
+
+struct WebmInputContext {
+  uint32_t chunk;
+  uint32_t chunks;
+  uint32_t video_track;
+  struct nestegg *nestegg_ctx;
+  struct nestegg_packet *pkt;
+};
+
+int file_is_webm(struct WebmInputContext *webm_ctx,
+                 struct VpxInputContext *vpx_ctx);
+
+int webm_read_frame(struct WebmInputContext *webm_ctx,
+                    uint8_t **buffer,
+                    size_t *bytes_in_buffer,
+                    size_t *buffer_size);
+
+int webm_guess_framerate(struct WebmInputContext *webm_ctx,
+                         struct VpxInputContext *vpx_ctx);
+
+void webm_free(struct WebmInputContext *webm_ctx);
+
+#endif  // WEBMDEC_H_