Merge "Update comment for new proto directory" am: 777d7d838a am: 9f5b01e691 am: 1592b52b91

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1513316

Change-Id: Iee4145492ba8f6821b1e0ddeb97e6205e778fd1a