On the roll here #76620

That includes the Dart roll here flutter/engine#24554

There are new analyzer "info" messages about unused elements, e.g. the class _RequestOptions here:

https://github.com/flutter/plugins/blob/master/packages/google_sign_in/google_sign_in_web/lib/src/generated/gapi.dart#L228

There are a number of related-looking commits in the Dart roll, e.g.: https://dart.googlesource.com/sdk.git/+/b7849ab93396d4f5a5b9f2a9747620ee80bfc4d1.

We need to either adjust the analyzer to restore the previous behavior, or fix the code generator that generates the gapi.dart file above to suppress the warning.

P0 since this blocks the Engine -> Framework roll.

@srawlins @stuartmorgan