Renamed EncryptionKeySource and WidevineEncryptionKeySource to KeySource and
WidevineKeySource respectively.
Replaced Initialize method with FetchKeys.
Added unit tests.
content_id parameter is now binary. Specified in command line with hex string.
Change-Id: I8010ca62d036cefb3a7c105e0eefee25bbf06d61
This CL also includes two related changes:
1. Support serialization of raw PSSH box;
2. Refactor segmenter interface a bit.
Change-Id: I668aa01a5a5ff524ad6fe74976339a3fd499120a
Thomas Inskip
KongQun Yang