This patch adds the --webm option, to allow the creation of WebM streams
without having to remux ivf into webm.
Change-Id: Ief93c114a6913c55a04cf51bce38f594372d0ad0
Initial import of the libmkv directory from the webmquicktime[1]
project, at commit fedbda1.
[1]: git://review.webmproject.org/webmquicktime.git
commit fedbda18de899ff94855cb334de7e471036fbf1d
Change-Id: I1564a0ebfa72293fc296ee02178196530dfd90e4