Merge "Introduce Build.VERSION.KNOWN_CODENAMES." am: 4db55d2f36 am: 5901c38224 am: d9e5f4369e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1966780

Change-Id: Ib904befa95b89da857df5373033865a8e6c55c10