Merge "Show secondary home handle in immersive apps" into rvc-dev am:...

Merge "Show secondary home handle in immersive apps" into rvc-dev am: babd08b5 am: 3abfe301 am: 7c44608a am: eccb3721

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

Change-Id: Icbcbf57fd36790f9385033ece44c00292d09ec97