ParentChildLayout:Default Parent Child Layout

Build 126 on layouts-first-core-move
1200px
Reviewing disabled
The baseline is taller than the new snapshot (1000x717 to 1000x701).
Baseline History
Build 1262e88fe7
Current build. There are unaccepted changes, so build 16 is still the baseline.
Build 16035ab45 current baseline
Accepted by Zhihao Cui.
Build 1cf98200
Auto-accepted
Commenting is disabled because there's a newer build on this branch