Chrome dev tools settings: where is the Experiments tab to Allow custom UI themes?

Question

I am using chrome version 36+

according to this page, I should be able to allow custom themes using the following instructions:

Installation Inst

Answer 1

loislo's answer is absolutely right (You need to restart the browser after changing the flag at chrome://flags). But notice that your chrome can work in the background. Go to the tray, look for the chrome icon and exit.