Sync profile image updates across tabs/frames

[zaach]

When #2095 is done we'll have a notification mechanism for signalling profile changes across tabs and frames. We should use that to keep the UI in sync.

[ncalexan]

Is this done? Ready for action? I'm trying to understand what the messaging will look like in clients if two tabs are open to accounts.firefox.com.

[zaach]

It's ready for action. How'd I imagine it'd work: when a page with an avatar loads, we attach a listener to notifications* that can fetch the latest profile data and update the view.

*notifications listens to events from other tabs: https://github.com/mozilla/fxa-content-server/blob/master/app/scripts/models/notifications.js#L47-L53

[shane-tomlinson]

This works now, closing.