Merge "Avoid deadlock in EventThread::onNewVsyncSchedule" into udc-dev am: e6cfeaad1f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/22125708

Change-Id: Ibe1c7c0b7e3b3885dae67a58bc34bc5cbab94fb4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>