Merge "doc getCallingPid zero return" into main am: 1b05f61bdb am: 1c66bd0b22 am: 84cb697e1c

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

Change-Id: If733d3e7d468a6d28c6645aa8a76742744b163a1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>