Merge "Don't cache IME surface in fullscreen mode" into sc-dev am: e81d43c1 am: 6799a29c am: 1b5b8ddb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14665440

Change-Id: Iea52ab899ef318610642b3d073784a182b81b9ca