Merge "Add flag LOG_DND_STATE_EVENTS to gate DND event logging" into udc-dev am: 0ecccdd1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22685083



Change-Id: Ie3badb909aead88a1bdb1924f0d6defd4a6e9bd6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>