Merge cherrypicks of ['googleplex-android-review.googlesource.com/28486314'] into security-aosp-udc-release. Change-Id: I0bef7f507d5d32de47960b1127967870b637a5d1
Android Core Library
Existing open bugs
File a new bug
File a new public bug
Import files from OpenJDK
Add nullability annotations
Run benchmark tests