<<It adds a browser action icon – when you click on it you get a list of your installed apps. From there, you can launch an app by either clicking on it in the list, or using arrow keys to select it and then pressing enter. It also does search as you type. >>

https://chrome.google.com/webstore/detail/odmpalfplhaahlgnkkonchfhpegdcgjm

Also

http://m.lifehacker.com/5716836/app-launcher-puts-chrome-webapps-in-your-extension-bar-for-quick-access