Allow applications to set a requested volume level on RouteInfo objects. If requested for a user route, the app-supplied callback will be invoked to perform actual volume adjustment. Change-Id: I856990a0da7292492aa15e6562dbc3d055b848a0
Allow applications to set a requested volume level on RouteInfo objects. If requested for a user route, the app-supplied callback will be invoked to perform actual volume adjustment. Change-Id: I856990a0da7292492aa15e6562dbc3d055b848a0