SDK / exoplayer

MediaCodecRenderer implementations require DrmSessionManager<FrameworkMediaCrypto>,
but it's currently not possible for an app to provide a custom implementation due
to FrameworkMediaCrypto having a package private constructor. This change exposes
public FrameworkMediaCrypto constructors, hence removing this restriction.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171718853