Merge "Change tile states strings to constants" into sc-dev am: e9d4150c am: fd7b9f05 am: d73c5bee

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15144191

Change-Id: I8e69da47399c2faedb12ee9db712de1edad7300c