Seems like Google is in full plan swinging to bring Android’s Google Now to the desktop, means now you can have Chrome’s own desktop notifications, according to Revision #171868 (via CNET). The revision says that the skeleton has been created for Google Now in Chrome:
Creating a skeleton for Google Now for Chrome implementation.
The CL creates the top-level structure for showing Google Now cards in Chrome via Chrome Notifications.
The implementation lives behind -enable-google-now-integration flag.
The final plans are yet to be confirmed although the impact will be on both Chrome and Android could be the real big as of now, Google Now cards will be represent through Chrome Notifications, which are already present in Chrome Browser.