Add voice interaction support to ResolverActivity/ChooserActivity

All options are sent to the VoiceInteractor once ChooserTargetServices
have reported in. We don't perform explicit progressive refinement or
filtering, but an explicit option picked will be invoked.

Also fix a lingering bug around being able to nested-fling the
resolver drawer closed.

Bug 21516866

Change-Id: I6b141f5fa87d74dccec9dcb88110630696e9c38e