Merge "EventThread: add annotations for mVsyncSchedule" into udc-dev am: 4038250f am: 1d6343e2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/22236938



Change-Id: I98a3c55c1c98beea7ab4331dab1573f20c84bd00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>