Merge "Use threadsafe death testing for dispatcher tests" into udc-qpr-dev am: 0b8abab2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23785088



Change-Id: Iad1f19dff873f3eb94ffb954948f7d0180b9f8f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>