There are three major issues that we need to fix for tests if we move the
OnContentBlockingEvent to the parent process. First, we notify the event
in the idle queue in the parent process. For some reasons, the test
script could outrun the callbacks of the OnContentBlockingEvent. So, it
could happen that the UI hasn't got updated while we check its state. To
fix this, we make the test script to wait the UI to be updated
explicitly.
Second, the tracking UI tests would access the ContentblockingLog in the
content in order to get the hosts of different blocking categories. And
the log in the content may not be updated when we open the subview. And
there is no explicit way to know whether the log is updated or not. So,
we use SetTimeout to temporary fix this issue. Once we finish the work
that moving the ContentBlockingLog into the parent (Bug1599046), we can
remove this work-around.
Third, there is one test that it waits OnContentBlockingEvent in the
content. We make it to listen the event in the parent to fix it.
Differential Revision: https://phabricator.services.mozilla.com/D55650
026b028a6a