The idea it to run an existing cypress test while
the same document is opened by a second user. The second
user does some activity (e.g. moving cursor, clicking, etc)
and we check whether it makes any interference with the first
user's view. The first user is doing the actual test's steps,
so we can see if interference breaks the assertions.
Now it's just a prototype for testing it in the CI setup.
Change-Id: I3e02c037754862d628c73bbb4b2d82ea84b8a719
5b0676bc3a