I\'m working on a Chrome Extension that interacts with Google Calendar. I\'ve open sourced it, and the code can be found on GitHub: https://github.com/joshholat/Add-to-Calendar-
I got it working after adding the following permissions to manifest.json
"permissions": [
"tabs",
"https://www.google.com/"
],
Make sure you are using the latest version of the Chrome OAuth sample code. I know at some point here was an update to how Chrome handled tabs and the OAuth sample got patched to work again.