Merge "doc getCallingPid zero return" into main am: 1b05f61bdb am: 1c66bd0b22

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2871539

Change-Id: I04e232498e79b62ca593a9ac34d9d5e4bdaee0fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>