Comment 7 for bug 1419645

Specification updated. <https://goo.gl/ibyRO3> (Canonical-only link, sorry) “When the device detects an incoming call: 1. A parentless dialog should appear instantly, showing the contact display name and (if there is one) the contact photo for the caller. It is parentless so that if you decline, or when the call ends, you will be returned to the window you were using rather than the Phone app.”