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

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

Change-Id: I19dbba35306786523ad573f3ada2a6517727aef7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>