Merge "Show secondary home handle in immersive apps" into rvc-dev am: babd08b5 am: 3abfe301 am: 7c44608a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11932144

Change-Id: I04c9c0e3d1bf118913dbe7ec7c78b6a3ffc927e1