Shows the current Chromium Week/Phase/Iteration when looking at the issue tracker.
Originally written by Andrew de los Reyes.
Version 5.0: Handle new Phase/Week instead of Iteration
Version 4.2: Add a popup & handle daylight savings
Version 4.1: Handle 3 digit iterations
Version 4.0: Rewrote iteration logic to fetch data from chromepmo.appspot.com
Version 3.3: Updated iteration # due to iteration 96 going long
Version 3.2: Updated iteration # due to iteration 85 going long
Version 3.1: Fixed URL matching
Version 3.0: Rewrote to use event/alarm system
Version 2.0: Updated to Manifest 2