One thing Google did real nice with Chrome. Making the chrome notifications run in the background to alert you of the notifications of browser and your android device. And Much more nicer thing was to give the chrome developers the access. That gave more space to developers and helped them extend their creativity while creating extensions. The best example is Pushbullet. I need not to tell you anything about it.
One more extension called Download Notifier has extended this feature of chrome notification by alerting you of a file download is complete. May be you’re downloading some large file and you’ve minimized chrome to do some other activity on desktop. As soon as the download is complete the file downloaded card pops up and clicking on “Reveal in finder” option(which should be “reveal in folder”) opens the folder where the file is downloaded.