Fix bug
3395289 Use MODE_IN_COMMUNICATION to evaluate stream vol changes
When the user is in a phone or VoIP call, the volume keys should
control the STREAM_VOICE_CALL volume. Before MODE_IN_COMMUNICATION
was introduced to cover VoIP use cases, having an active VoIP call
was determined by checking whether there was any track used the
output stream STREAM_VOICE_CALL, which can give false positives.
This CL checks instead against the audio mode to see if
MODE_IN_COMMUNICATION is selected to determine if a VoIP call
is in progress.
This implies that applications that play on STREAM_VOICE_CALL
shouldn't rely on that fact alone to expect the volume keys
to control the STREAM_VOICE_CALL volume, and should instead,
rely on the official mechanism for that:
android.app.Activity.setVolumeControlStream(int)
Change-Id: Ia487951ea1684477aa3d522c9031fad484d8a40d