Merges missing bits from the Widevine CDM repo for
https://widevine-internal-review.googlesource.com/#/c/10653
Most of this change was submitted into lmp-dev, but some tests
were ommitted. This CL completes the missing changes from the
original widevine repo commit.
It also fixes some missing test installation commands.
b/15388863
Change-Id: Id59d885780134c6c6863477f8c49fb9d8ffe509d