Merge "Add traces for waitForAllWindowsDrawn logic" into tm-qpr-dev am: fc9878c103 am: 8bc881334a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21145338

Change-Id: I1a85c7ca6078612c4382be46bdbd8144458366f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>