If you are a Ubuntu as well as Google Keep user, here is a quick and easy way to add Google Keep to the Unity Launcher.
This trick only works in Google Chrome.
1. Open Google Chrome and install the Google Keep app.
2. Launch the Google Keep app. It should show up in a new window. In your Unity Launcher, you should also see a new Google Keep icon.
3. Right click on the icon and select “Lock to Launcher”.