Merge "Fix NPE on WindowContainer#isOnTop" into rvc-dev am: e0ac89603b am: ae03bf3cd0 am: f1f00d28fd
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11882882 Change-Id: Ic4add6411e78c08fc61973ceecaf40c52b816b3b
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