Merge "Track transaction merges through transaction trace" into udc-dev am: addae5a2 am: 86e1289d am: 7d4d5d35

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/22688403



Change-Id: I13b19ea3d0f6ff118dbc71002954ef17496ccba0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>