Merge "Don't create one-handed-background-panel after rotation" into sc-dev...

Merge "Don't create one-handed-background-panel after rotation" into sc-dev am: ab89e910 am: 19340641 am: b60af8ab am: 5fd2148f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15537318

Change-Id: Ib63c495b21f0749e9ea86e8bf57e558b936c9dd4