Proper supplementary service notification handling (1/5).

Remove CAF's passing of implementation details from the base classes,
and replace it by well-defined call properties.

Change-Id: I4fa94d4ba68a1570d3f822be569ae124882c0e66
SystemUI: fix right hand side gestures on lockscreen

two finger quick pulldown was not accounting for being in the keyguard
adn was eating touch events when it shouldn't be.

Change-Id: I625d48a4002aaaf2d55d7efaed65d892ab7aa13c
Signed-off-by: Roman Birg <roman@cyngn.com>
SystemUI: fix status bar brightness slider eating events

In some cases it would eat the event and not lose focus to the rest of
the system.

Change-Id: I94d532d09ea762edf7ac037043ed023caf42c401
Signed-off-by: Roman Birg <roman@cyngn.com>