Can you increase Deceive's Critical Damage (Shaco)?

I am interested in playing Shaco but have a fundamental question.

Does the critical damage from Shaco's Deceive ability benefit from Infinity Edge or +Crit Damage Runes?

The reason I ask is his ability is phrased thusly:

Deceive - Shaco stealths himself instantly and teleports to target location. His next attack is guaranteed to critically strike. Shaco instantly stealths for 3.5 seconds, and teleports to target nearby location. If he attacks while stealthed, the attack is guaranteed to crit for 40/60/80/100/120% bonus physical damage.

It seems counter intuitive to have the damage be called both critical and bonus damage and increase as the ability is leveled up.

I pose the following scenario: Shaco with level 5 Deceive and Infinity Edge. We will assume he is doing a total of 100 damage to make the analysis easy. On attack after using Deceive will The attack deal 220 Damage (100 base + 120 from deceive) OR will the attack deal 270 damage (100 base + 120 from Deceive + 50 from Infinity Edge). If neither of the above scenarios are correct please enlighten me as I may be misunderstanding the interaction Infinity Edge has with base attacks compared to base attacks modified by abilities.

Edit: The following link may be helpful but they didn't really clarify as there may be a discrepancy between the European and US regions. Shaco, Deceive and Crit Damage Runes (EU)

This is straight from the LOL wiki:

http://leagueoflegends.wikia.com/wiki/Shaco_the_Demon_Jester/Strategy

The bonus critical strike damage from Infinity Edge will apply on critical hits from Deceive, in addition to the bonus magic damage the ability gives.

So to answer your question: Yes Deceive benefits from Infinity Edge. It stands to reason that it will also benefit from Crit Dmg Runes. With that said, the following has been taken from League Craft forum posts: http://forum.leaguecraft.com/index.php?/topic/6388-shaco-deceive-crit-dmg-runes/

Not sure about the math or the mechanics behind it, but I just tested Deceive at level 1 on a Master Yi at level 1 in a practice game, once with a full page of Crit Damage runes and one with some other random page that wouldn't affect the damage. All other factors were kept the same both times. Results: Without Crit Damage runes: 64 from the front, 80 from the back With: 85 from the front, 100 from the back

Of course, that was in June 2010...