Merge "Introduce Build.VERSION.KNOWN_CODENAMES." am: 4db55d2f36 am: 5901c38224 am: d9e5f4369e am: c4dcf0c319

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

Change-Id: Icae3207485650b94c5abd26325ddb639a8a40646