Add nullability annotations for java.logging.Level and Logger.

The Logger annotations reflect the fact that the various log* methods
are fairly tolerant of null arguments. Although this tolerance isn't
always documented in Logger itself, it is documented in the
equalivalent setters and getters in LogRecord.

Bug: 64930165
Test: make core-current-stubs-nullability-validation-check-nullability-warnings
Change-Id: I80209a3749918cf0a3afe8de51700e1cf31e75f2
2 files changed