Merge "Making mirror slider appear when brightness slider is used in split...

Merge "Making mirror slider appear when brightness slider is used in split shade" into sc-v2-dev am: 21cb5e5b am: c9a49c10

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15328600

Change-Id: I0ee7614ad7b26ea92a3d9b64a6f2e2a852cf5435