Communication between Chrome Extension and Theme?

I create a Chrome Extension and I have a theme too. In the extension I made a link to the theme (kind of self advertising). I want to hide this link if the theme is in use.

I know extensions can pass messages if 开发者_开发百科their ID is known. But is there a way to check if given theme is in use, as themes has their own id too? I tried:

chrome.extension.sendRequest(string extensionId, any request, function responseCallback);

but it does not work, as there is no way to respond with Theme. Only thing I need is the javascript code for this. No more, no less. Thanks in advance!

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Theme has unique ID (you can get it from webstore URL), so you can check if it is installed using chrome.management.getAll() method.