Bug 1009157 - Ensures that we can receive BT enable/disabled events in marionette test every times. r=echou

Ensures that we can always receive that "enabled"/"disabled" event by
installing the event handler *before* we ever enable/disable Bluetooth. Or
we might just miss those events and get a timeout error.
Bug 973777 - Breaking down the information of GrallocReporter. r=njn
Bug 976024 - Track Unique Set Size in the Developer HUD. r=21, r=njn