[Output Switcher] Update fields for Output Switcher metrics event

eldar review: https://eldar.corp.google.com/assessments/964900225/revisions/5?mods=eldarui_search#sections/999008000

Bug: 268428968
Test: N/A
Change-Id: If46a815708cabf793512e91ba34c3ee2bf842b2f
2 files changed
tree: 739fcc8567936aa811ea56b47a2a4ab9a23d7970
  1. stats/
  2. OWNERS