AreaChart:With steps, fmt and labels

Build 1162 on next
1200px
Reviewing disabled
Baseline History
Build 116206a6ee6
Current build. There are unaccepted changes, so build 927 is still the baseline.
Build 927c24f8ad current baseline
Accepted by Archie Sarre Wood.
Build 85522c35f6
Accepted by Zach Stence.
Build 852bab0b35
Accepted by Zach Stence.
Build 8426623eea
Accepted by Zach Stence.
Commenting is disabled because there's a newer build on this branch