Autoupdate data presented in popup

[sean-roberts]

As errors happen, update the ui popup with the new data.

We're already listening for error events on the background script. Pass that data along to the pop up so it can update.

[sean-roberts]

We can register on opening the tab (this could be how we populate the ui to begin with, just open up a tunnel for data) with a function on the background script that says we are viewing a certain host/tabid and for it to call the registered callback when it encounters errors for that tab. On close of the tab, simply remove the listener.