Update ScreenshotRuleAsserter to support capturing a screenshot from a specified display ID

Test: Ran v2/wear-engprod/suites/test-mapping-presubmit-cloud-wear
Flag: EXEMPTED test only
Bug: 401504441
Change-Id: Ib82a42c0cba2b7d913c080cd470b78b4ee625dc7

2 files changed