(This is a merge of http://go/wvgerrit/95003.) To reduce the number of OEMCrypto calls on the decrypt path, the maximum subsample size will now be cached after the first call to retrieve it. Bug: 150018606 Test: Android Unit Tests Test: CE CDM Unit Tests Test: ExoPlayer high-bitrate playback on OEC v15 Change-Id: I0b5d38d8a082c0a127d2a47f112b76c64085bddb