To validate the PSSH init data passed to EME, I'd like to reuse the same
PSSH parser that the ClearKey CDM shared library uses. So move the code
out of gmp-clearkey and into its own library, so we can link it statically
into code that needs to use it.
MozReview-Commit-ID: 7xSUSmCueJz
--HG--
rename : media/gmp-clearkey/0.1/ClearKeyCencParser.cpp => media/psshparser/PsshParser.cpp
rename : media/gmp-clearkey/0.1/ClearKeyCencParser.h => media/psshparser/PsshParser.h
extra : source : 78dcbc5d3c26547c63269eb14034a67863cf28de