Just like Gmail Notifier extension for Mozilla Firefox, there exist an extension / plugin for Google Chrome known as "Gmail Checker". Gmail Checker alerts you whenever a new email arrives in your Gmail account.
Tidbit : Top 10 Google Chrome Extensions / Plugins
Gmail Checker adds a cool button beside your Google Chrome address bar as shown in the screenshot below.
Whenever a new email arrives, Gmail button color changes from blue to red along with the small counter representing the number of new emails. After downloading and installing Gmail Checker extension, you need configure it once for your Gmail account. Just click on the Gmail button and it will take you to the Gmail login page where you must login once with your Gmail ID in order to initialize the extension.
Download Gmail Notifier Extension
Before downloading, if you are unsure how to install CRX extensions in Google Chrome, please follow this tutorial.Contact Us for News Tips, Corrections and Feedback