Add "long-touch" event #5
Description
If a user wants to implement an action on the base button but still use the drawer, we need to differentiate between the user's intent--whether we should launch the base action or open the drawer. I think it makes sense to implement an android-style "long-touch" event on this, so if the user taps the base button, it launches the base action, but if the user holds the base button, we show open the drawer.