Initial commit of all previous Chrome build scripts.

chromium/patches/to_upstream/11b_mkv_buffer_overflow.patch

+diff -wurp -N orig/libavformat/matroskadec.c ffmpeg/libavformat/matroskadec.c
+--- orig/libavformat/matroskadec.c      2011-07-12 20:48:14.532933135 -0700
++++ ffmpeg/libavformat/matroskadec.c    2011-07-12 20:48:14.583029843 -0700
+@@ -672,9 +676,10 @@ static int ebml_read_float(AVIOContext *
+ static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
+ {
+     av_free(*str);
++    *str = NULL;
+     /* EBML strings are usually not 0-terminated, so we allocate one
+      * byte more, read the string and NULL-terminate it ourselves. */
+-    if (!(*str = av_malloc(size + 1)))
++    if (size < 0 || !(*str = av_malloc(size + 1)))
+         return AVERROR(ENOMEM);
+     if (avio_read(pb, (uint8_t *) *str, size) != size) {
+         av_freep(str);
+@@ -931,6 +938,8 @@ static int matroska_probe(AVProbeData *p
+      * Not fully fool-proof, but good enough. */
+     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
+         int probelen = strlen(matroska_doctypes[i]);
++        if (total < probelen)
++            return 0;
+         for (n = 4+size; n <= 4+size+total-probelen; n++)
+             if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
+                 return AVPROBE_SCORE_MAX;