Seems like this should be simple, but I'm not finding a simple answer....

Is there a tool that you what keywords a page is ranking on in the search engines?

For example, if I have a page such as:
http://www.codeguru.com/csharp/winrt...th-dxtreme.htm

I want to know if this page (article) is ranking on any keywords.

Google Analytics and other tools will tell me what keywords are driving traffic to a site, but not at a single URL level (without setting the tracking up to that level). I also can find lots of tools to let me see if a keyword is ranking and at what rank.

But I want all of this from the opposite direction. I have the article URL, I want to be told what keywords are working for it.