QA:QA

Build 12946 on stepped-tracker-vertical
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Baseline History
Build 129462113e97
Current build. There are unaccepted changes, so build 12915 is still the baseline.
Build 12906d16519e
Accepted by Zhihao Cui.
Build 1258525d0afb
Accepted by Zhihao Cui.
Build 12572a607a7b
Accepted by Zhihao Cui.
Commenting is disabled because there's a newer build on this branch