Merge "Fix low contrast text in add user dialog." into udc-dev am: 59ecd6a40a am: e60a8778b7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23450544

Change-Id: I27baaab031f9e07f8a1bbe118ac8469d56066954
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>