Merge "Update arrow color after all notifications dismissed." into sc-v2-dev am: 3a91a6241f am: 52b9feb353

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15936544

Change-Id: Ie93b7aa71dbcd9545d2fc617101ed4a36db54742