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Commit 0e1334ac authored by Marvin Ramin's avatar Marvin Ramin
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CEC: Add listener for HDMI CEC volume control feature 

Adds a listener to receive updates to the state of the HDMI CEC volume
control features.

Interested parties can register and unregister to get notified about
state updates which are sent on every change to the value.

Test: atest HdmiControlServiceTest
Bug: 152018314
Change-Id: I342d748114bae99b3c3f236502d73bfeac9e9ac5
parent 1c6f2f49
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