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 am: 89ac5577

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



Change-Id: I0a51c0db0370789f1ba1395fd9a688aa71d1bbfc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>