[automerger skipped] Merge "[Status Bar Refactor] Move PanelBar#updateScrimFraction into ScrimController." into sc-v2-dev am: a06b1666 am: 6575c252 -s ours

am skip reason: Merged-In I37df95015002825adf7217c4144950e85485af84 with SHA-1 b40a7021 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15993903

Change-Id: I1d75b8447f6b03e88eaea0bb81c71df0ab86bcf0