Google Keep launched on Android last month, and despite having available online, there is still no official Google Keep extension for Chrome. However, a third-party developer has answered the calls of people who have already adopted the service into their daily lives, by releasing an extension for Google Chrome which can be downloaded right now.
The extension its alongside your address bar displaying the Google Keep logo. Clicking on it opens up your Google Keep profile in either a separate pop-out window or in a new tab, depending on your preferences. It can only do the basic things, as at the moment it is missing the ability to post recordings, however its a start, and hopefully Google will release an official version soon enough.