Christopher Tate c4b78d206f Support volume-changed sounds on master-volume-only configs
Some products manipulate only the master volume, and the existing
code does not play volume-change tones when the master volume
is adjusted.  This CL includes some config-driven behavior that
will play those tones (via the system stream) if desired.

Bug 6498986

Change-Id: I2415773325d0a0039efc67897bc371b1f2e18063
2012-05-24 17:30:39 -07:00
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