7d46e82bcd
New class VolumeInfo to communicate any type of volume information, such as volume type (stream type vs volume group), index and associated range. New manager class AudioDeviceVolumeManager to serve as the client-side code for setting absolute volume for a given device, and registering the corresponding volume change listener. This is not done through AudioManager so as to not keep on piling functionality into it that increases its memory footprint. Bug: 201781907 Test: upcoming after hook up in AudioService Change-Id: I97fd1827f27f55a90d92c538c142a4d9aae966b3