This is a tracking issue for the work to make pointer events support multi-view on the web.

Summary: The PointerData class has a new viewId parameter that we should use to indicate which view received the pointer event.

Questions:

1. Are pointer event offsets supposed to be relative to the top-left of the Flutter View that received them?
2. What's the expectation when drag-n-dropping across Flutter Views?
   • Is the down state shared across all views?
   • Should we send move events to the source view and hover events to the destination view?

cc @goderbauer @ditman