Libwebm v1.0.0.28

This collects many bug/stability/fuzzing fixes, the conversion of the
library to C++11, the addition of support for Projection/Chromaticity
and a rewritten incremental parser, webm_parser.
add CONTRIBUTING.md

this contains some of the basics for contributing patches to the
project. over time the instructions from
https://www.webmproject.org/code/contribute/submitting-patches/ can be
added here.

Bug: webm:1680
Change-Id: Ief35b489260c4dd29fa73f909d918453a83985d8
1 file changed