Exoplayer 2.6.1 Audio and Subtitle Group Support

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### [REQUIRED] Searched documentation and issues
Yes

### [REQUIRED] Question
We are using Exoplayer Version 2.6.1.
Please let us know whether below Subtitle and Audio Group in a single **HLS Stream** is supported ?
Same data is available in attached excel sheet also.
[Exoplayer_2.6.1_ST_AudioGroup.xlsx](https://github.com/google/ExoPlayer/files/4535805/Exoplayer_2.6.1_ST_AudioGroup.xlsx)

**Subtitle Groups**
Group 1:
Language A Webvtt track A
Language B Webvtt track B

Group 2:
Language A SMPTE-TT track A

Group 3:
Language A SMPTE-TT track A
Language B SMPTE-TT track B

Group 4:
Language A SMPTE-TT track A
Language B Webvtt track B

Audio Groups:
Group 1:
Audio group 1 with 1 language A 40 kb/s AAC HEv1 for lowest profiles
Audio group 2 with 1 language A 160 kb/s AAC HEv1 for highest profiles

Group 2:
Audio group 1 with 1 language A 40 kb/s AAC HEv1 for lowest profiles
Audio group 2 with 1 language A 480 kb/s AC3 PT for highest profiles

Group 3:
Audio group 1 with 2 languages A & B 40 kb/s AAC HEv1 for lowest profiles
Audio group 2 with 2 languages A & B 160 kb/s AAC HEv1 for highest profiles

Group 4:
Audio group 1 with 2 languages A & B 40 kb/s AAC HEv1 for lowest profiles
Audio group 2 with 1 language A 160 kb/s AAC HEv1 for highest profiles
Audio group 3 with 1 language B 480 kb/s AC3 PT for highest profiles

Group 5:
Audio group 1 with 1 language A 40 kb/s AAC HEv1 for lowest profiles
Audio group 2 with 1 language A 480 kb/s AC3 PT for highest profiles

### A full bug report captured from the device
NA

### Link to test content
Not Available Currently