Merge "Postpone window_state_changed events until the window is added" into...

Merge "Postpone window_state_changed events until the window is added" into tm-dev am: 857459ff am: ecf6e4fb am: cd29bb24

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17741153



Change-Id: Iaf9c6d8093c4d744594c594ee5e9320a97a52e4b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>