WearMediaOutputSwitcher: sync v4 PDD changes

Add new enum value for watch speaker and update comments.

PDD: https://eldar.corp.google.com/assessments/953333269/drafts/790173676?jsmode=o#sections/999001

BUG: 259640267
Test: m
Change-Id: Idcf32c5080c2f8eb73304992c0b9b749bd2a2934
2 files changed
tree: 5d8e50b5acf9695fbd31258af08897b35b20ed4f
  1. stats/
  2. OWNERS