SetCooldown
He's adding a cooldown on top of the playerframe for the example.
You would do the same for your frames.
If you want to do that in .xml you'd add a Cooldown as a child of your frame something like this:
Code:
<Frame name="YourFrameNameHere">
<Frames>
<Cooldown name="$parentCD" inherits="CooldownFrameTemplate" parentKey="cooldown" />
</Frames>
</Frame>
The inherits and parentKey attributes are optional, parentKey makes it so you have a reference to your cooldown frame on its parent ie _G["YourFrameNameHere"].cooldown let's you run methods on the cooldown.