Merge "Add launcher for night mode" into rvc-dev am: 3e2aeedd4e am: 2ceb6378cf

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DocumentsUI/+/11738497

Change-Id: I84c09be58f05c3c4feaba8c91bdfdcbbd58b966a