Intent chooser callback

Let an app specify an IntentSender as an extra for ACTION_CHOOSER that
will be notified of the user's chosen target. Apps can use this to
implement things like one-touch last used affordances without
implementing their own one-off chooser UI.

Bug 17363684

Change-Id: Ic5d1d0e0c7a0bae3eda6b1d6ade993f3ba865cfa