This move is the first step by the browser builders to add a notifications system to Chrome, which could deliver the same detail we see in Google Now for Android, including weather, navigation and traffic, sports results, flight plan details, movie show times, and more.
Ultimately, all roads lead to Google. Though the Google Now system is capable of displaying at-a-glance information for all of the data it accesses, it primarily serves as a one-touch search query based on the things that Google assumes a user will want to know. Google Now for Android collects personal information from a wide range of opt-in sources, including search history, map searches and the application's own user settings. From this information, Google Now can tailor a "feed" of information to each user, pushing its customers to its consumption services; Search, YouTube, Google+, etc.
With the Chrome Web Store and its growing catalogue of apps, adding Google Now and a broader notifications system to the browser is a clever move by Google, allowing less opportunities for users on desktops and laptops to leave the browser environment.