App|acceptance:polymer-cli

Build 12250 on 7543-cli-mdx
Reviewing disabled
Baseline History
Build 122500845864
Current build. There are unaccepted changes, so build 12226 is still the baseline.
Build 1219581d78be
Accepted by Kai Röder.
Build 12171d35177d
Accepted by Michael Shilman.
Build 1216838d8c4f
Accepted by Gaëtan Maisse.
Commenting is disabled because there's a newer build on this branch