Add missing safety comments. am: 03350bc91d

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2776851

Change-Id: I8c1f292db17cca39a2c62833b906a46e71e42020
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>