am 68809163: merge in master-release history after reset to 5a20108b1148f45a976841efe1188dfa82ac8517

* commit '68809163646c6c437235723651915ba9056a1cfa':
  Test MediaPlayer.release() with blocked network
  Change expectations for high precision doubles.
  Mark classes of tests for bionic known failures.
  Don't NPE when no security message is provided.
  Test proper detection of character set encodings