Close inline controls / hide the gear when interaction outside occurs

This CL adds the behavior so that if the gear or inline controls are
visible, they will close if the user interacts with another area of
the screen (e.g. scrolls, pulls down QS, etc) this is on the lock screen
as well as the shade.

This CL makes an additional change to remove the GearDisplayedListener
and use the StackScroller to maintain state of the gear / reset as
appropriate.

Bug: 27598072
Bug: 27335311

Change-Id: Iebff9aa542c9d91389054a4ff292d0dda11fe950