RESTRICT AUTOMERGE Use chain start token in performOpTransaction am: 297388e374

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20510886

Change-Id: I5c971cb5cacf6a49d79296a94ffbb3d9b3908873
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>