Chrome web app gives the native app feels for website.  You can create a shortcut either desktop or application menu  and use app like native app in separate window. 
Step 1 : Right click on app icon . Select “Open as window” .

Step 2 : Click on “Create Shortcuts” . This will create shortcut in your application menu.

Step 3: Wanted to launch app . Click on dash search and type “app name”.

Note : You can install chrome apps from chrome app store if it is not available then you can create it own .