Implement test: Accepted calls are displayed in Full Screen if and only if Active
Call is enabled.

Test: Active-call on: https://paste.googleplex.com/5135860945649664
      Active-call off: https://paste.googleplex.com/6028226233630720
Bug: 273366005
Change-Id: I344bbd2c12f5082e479682280f4bab242aea07bd
10 files changed