I think Google Chrome has 23 different levels of zooming allowed for web pages. That's a lot, but it's still possible to have 23 Find Images that search for your icon. You could even put the most common icon sizes first, so the number of Find Images that has to be executed could be smallish, like maybe 5 or 10. That would still be pretty fast. Perhaps like the following... In this example, I'm showing you how to use Find Image for two different sizes of dots. If the first one isn't found, it will return the empty string to %FoundImage% which means that the second Find Image action will attempt to find a different size of the same image.
Yes, creating 23 of these actions in a row would seem like a lot of work, but it still shows that it can be done and you probably wouldn't even find it to be slow.
You should also attempt to solve this problem using the Button action that I mentioned. This would be much easier, if it works.