Add mediametrics enum for MediaExtractor usage

Bug: 170386720
Test: Manually built the tree.
Change-Id: I953dd1891ef71dd9d5afbf8e154fdf0a3095d913
(cherry picked from commit bfe14daff838fc220a81934a9e37083f816f24da)
Merged-In: I953dd1891ef71dd9d5afbf8e154fdf0a3095d913
Merged-In: Id10861db464b88734c34c81db945b1a828f0bc2c
1 file changed