[1/3] base: omniswitch as default recents

OmniSwitch provides broadcast events for showing
and hiding the overlay

We need to make sure that OmniSwitch service is really
running else we will get no recents at all. Also on startup
it will take some time until the OmnISwitch service
has been started.

OmniSwitch will send a service start and stop broadcast
that will guard the usage of OmnSwitch

Change-Id: I31c5ae8839603b6e92b1a4613c793a9427aad2e2
Merge "[1/3] base: omniswitch as default recents" into android-4.4
Merge remote-tracking branch 'omni/android-4.4' into android-4.4