Merge "Wait for dispatcher idle before asserting policy callbacks" into udc-qpr-dev am: 11512800

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23730568



Change-Id: I5390deb65e3beda8a854fb818d549075a0972659
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>