Also add API for voice interaction service to control
whether the system should hold a wake lock while it is
working with an activity (and actually *do* hold a wake
lock while doing so, duh!).
And while in there, clean up the launching wake lock to
correctly give blame to the app that is launching.
Change-Id: I7cc4d566b80f59fe0a9ac51ae9bbb7188a01f433
3d07c94c39