Copying the 2nd-to-last API into a convenient place to pass to Metalava

so we can temporarily ask Metalava to use API 28 as a baseline for
downgrading @Nullable/@NonNull to @RecentlyNullable/@RecentlyNonNull .

This should provide more time to migrate calling code.

This is mostly a combination of

  aosp/699347 - Add genrule to find API file Metalava used to generate annotations

and

  aosp/880079 - 123197896: The last-released API file is the wrong one

Test: m api-stubs-docs # and unzip out/target/common/docs/api-stubs-docs-stubs.srcjar \
      and notice that @Nullable/@NonNull are replaced by @RecentlyNullable/@RecentlyNonNull

Bug: 140127380
Change-Id: I96b4196292d878892c8cca5aade2ed4034939f4c
1 file changed