1. If an accessibility service does not specify that it handles any
event types it was never added to the list of services while
the system is bound to it. Since the service is not in the list
with enabled services we never unbind it, hence it consumes
resources without doing nothing. This is also semantically
incorrect because a sevice may not want to receive events while
handling only gestures.
bug:5648345
Change-Id: Id478a4704cdeeb1729330f6ae4b8ff9e06320952
1f22b6a25d