Chromium change: https://source.chromium.org/chromium/chromium/src/+/6500325e057365791ae060e8c8405fd43ff48fab Android: Make MonotonicObservableSupplier implement Supplier<@Nullable> And fix all warnings that result from doing so. Supplier.get() is still being treated as @NullUnmarked. That's the last step in this migration! Bug: 478248581 Change-Id: I0158e81ec0a739e05c6d89a28586f78b1e633ce5 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7531037