Merge "Add launcher for night mode" into rvc-dev am: 3e2aeedd am: 2ceb6378 am: fc0659e3 am: dfc1dcba

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

Change-Id: I5725ba4d109da0b05138bde6bcbe16351d14b486