Merge "Add methods to get vendor extension interfaces" am: 1d6f1c9d04 am: 8ed7a545a7 am: bd75d74c59

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1826093

Change-Id: Id5afa9a3006a1f10228d1842892d317e0b93dac8