Merge "Expose service changed event to application (2/3)" am: 199d2c73 am:...

Merge "Expose service changed event to application (2/3)" am: 199d2c73 am: 90fd6a30 am: b9fadf69 am: 0e73bae3

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1433925

Change-Id: If6b1bd5ee1e3719c1f803ad06eb5e5fa931398df