Merge "Ignore window manager dumps with no timestamp in timeline" into udc-dev am: 1a4ebace28

Original change: https://googleplex-android-review.googlesource.com/c/platform/development/+/23660823

Change-Id: Id3464a5439e6075df39f286c9e9cced3d314303f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>