Merge "Show secondary home handle in immersive apps" into rvc-dev am: babd08b5b1 am: 9551b9ad72

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

Change-Id: Ia9b88d513ee8af5552eb6f2e05f67edd799dc775