Merge "Use actual resizability for split-screen operations" into rvc-dev am:...

Merge "Use actual resizability for split-screen operations" into rvc-dev am: 058a713a am: ef6d79a5 am: 6d0d75b6 am: a8806e08

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11854827

Change-Id: I01e0fc2d778121f905b8bc17b92132081f88e43f