I don't think google accepting bitcoin would be that big of an deal. Most of their revenue comes from advertising which is generally paid for by businesses. I don't think it would do very much to increase consumer adoption of bitcoin although it may help increase the level of business to business transactions
+1
I think it would be a short term little spike, then a drop as people realise it doesn't really change much.
User adoption of Bitcoin-only apps is the big deal.