Engine->framework roller blocked due to JSArray/JSPromise type annotation requirement

Analysis of the flutter_plugins repository is failing because `JSArray` and `JSPromise` now require type annotations.

See https://dart.googlesource.com/sdk/+/e6a313568c5835f177cf2c354a79ffbee8246adf

Example roll: https://github.com/flutter/flutter/pull/140016