Merge "Add launcher for night mode" into rvc-dev am: 3e2aeedd am: cf4764a4 am: 18d0ba52 am: 8474fda9

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

Change-Id: I2f163e4390f3b86fd0a1c335dacd23f8805826a1