We want to create a integration test harness for Flutter Web engine where we can test the integrity/sanity of the web engine and framework together. Ideally the test harness should be able to:

• Access DOM and window properties.
• Dispatch events.
• Access widgets and interact with the widgets.
• Running in many browsers in different modes (debug, profile, release modes) and on different engine versions.

In order to achieve this goal, we decided to use e2e package for the integration tests.

This issue is to track the changes needed for web to run with e2e.