Change-Id: I4f64d46ca4873711300ae175c5f5646ca1a7c366
Change-Id: I2658eae0789f1c4e8d0534a6ff70267058bee2fc
Also includes a dummy packager_test with TestingMuxer. Change-Id: I6a6e6dd77e343ef742adc1846ede203993628943