Merge "Fix NPE on WindowContainer#isOnTop" into rvc-dev am: e0ac89603b am: ae03bf3cd0
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11882882 Change-Id: I9b964cdc195ec513ebca2c3c19729a4b027b5cd0
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