The problem is that the assistant doesn't draw its own
UI in some cases so even though it's in the background the user
considers it as a foreground app. We can check if the app trying to
access the microphone currently has a voice interaction session which
should be a good indicator that the user intends to user the app.
Test: Use the assistant, observe dialog
Bug: 178243539
Change-Id: Ie17f6e47a002e75467cce23fd74f5fcbc92aa577
11b564feb1