DO NOT MERGE Initialize VolumeUI when volume change event is received.

We can reduce boot time, by having CarStatusBar listen for Volume change events and have it initialize VolumeUI when the first of such an event is received.

Bug: 143107490
Test: Manual
Change-Id: Iee8a68197bbb40b8d93d2cf4cfd3e8a1f41d2212
(cherry picked from commit 4d45b5557929b1390d75c9b1c3ee8622b18023a7)
3 files changed