[automerger skipped] [automerge] RESTRICT AUTOMERGE Use chain start token in performOpTransaction 2p: 9d09846798 am: 7799cef625 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20521154

Change-Id: I12ad1c0d4730965588c5ed55bf95c5c1968375c7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>