libvpx: Pull from upstream

source/libvpx/ivfdec.h

Index: source/libvpx/ivfdec.h
===================================================================
--- source/libvpx/ivfdec.h	(revision 0)
+++ source/libvpx/ivfdec.h	(revision 0)
@@ -0,0 +1,30 @@
+/*
+ *  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 IVFDEC_H_
+#define IVFDEC_H_
+
+#include "./tools_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int file_is_ivf(struct VpxInputContext *input);
+
+int ivf_read_frame(struct VpxInputContext *input,
+                   uint8_t **buffer,
+                   size_t *bytes_read,
+                   size_t *buffer_size);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* IVFDEC_H_ */