Bug 892605 - part 0: add callMethod to WidgetHelpers, checkItem to SideMenuWidget; r=vporof
Bug 892605 - part 1: move the BlackBoxChange DOM event to blackboxchange thread client event; r=vporof
Bug 892605 - part 2: add 'dbg blackbox' and 'dbg unblackbox' gcli commands; r=vporof