Similar to sheriffbot. Basically, you can load garden-o-matic on the bot. Do some rebaselines. Then click a button and have it upload a patch to bugs.webkit.org for you (a la sheriffbot rollout). This means people don't have to run it locally if they don't want to or can't for some reason. In my case, with bug 88437, I accidentally committed the expected result file to the wrong place and don't have a machine at home with a checkout. Rebaselining would fix it. I think it also makes it easier for someone to do some drive-by tree greening when they have a few extra moments.