Merge "Remove IME surface when occured in multi-window mode" into rvc-dev am: b55bc82d13 am: c56f6b53b7 am: d9c7811096 am: f94c0351d1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11612967

Change-Id: Icc888a3cdc135b11f5b6e9eeaf226829fc5a9be7