DesignableBanner:DesignableBanner with reminder CTA

Build 9206 on tf-banner-ac-fix
1200px
Reviewing disabled
The baseline is taller than the new snapshot (1300x434 to 1300x392).
Baseline History
Build 920685de6a6 current baseline
Current build. Accepted by Tom Forbes.
Build 9091a51ebbd
Accepted by Tom Forbes.
Commenting is disabled because there's a newer build on this branch