Change-Id: I2aeb506e5bf7e2301e855456688273fe5f3988a2
Change-Id: I2658eae0789f1c4e8d0534a6ff70267058bee2fc
Also includes a dummy packager_test with TestingMuxer. Change-Id: I6a6e6dd77e343ef742adc1846ede203993628943