These were all checked with codesearch to ensure nothing is overriding
these methods.
For the most part, I've updated the signature to use nullable types; for
two Pager's, I've just made all parameters non-optional, because you're
already forced to pass them with a required parameter at the end.
Bug: T231636
Change-Id: Ie047891f55fcd322039194cfa9a8549e4f1f6f14
e3412efac3