* Moved the default BinaryMessenger instance to ServicesBinding
This reverts commit 821602aef3.
* Added assertion in defaultBinaryMessenger. Also fixed the devicelab tests.
Automated Flutter integration test suites. Each suite consists of either a
complete Flutter app and a flutter_driver specification that drives tests
from the UI, or a native app that is meant to integrate with Flutter for
testing.
Intended for use with devicelab tests.