Can `chrome.*` extension API's be used inside content scripts?
===

I am trying to use `chrome.windows.onCreated` but I got `Uncaught TypeError: Cannot read property 'onCreated' of undefined `. I noticed in the samples, all calls to `chrome.*` API's seem to originate from background scripts? Can I not use them in content scripts? 

I want to trigger clicks in my browser. Then get some information (scrape) in popup window. For that I think I will need to know when a window is opened. So I need `windows.onCreated`? Can I use that in content scripts? Or how will I combine background and content scripts? 