Google Chromebooks comes without a caps lock key. There are few ways by which you can get the caps lock key.
One way is by turning the Search button into a Caps Lock.
To do this you have to go to “Keyboard Settings” under the “Settings” menu, and select “Caps Lock” under the “Search” drop-down menu.
Or use this link to go directly to the settings: chrome://settings/keyboard-overlay
Enjoy smile