In Google ,they want only talent.Google is a that kind of company which doesnot want even degree.You don't need any minimum cgpa to seat in the exam .There isnot any kind of criteria to seat in the google interview.They will organise there own test and you have to clear round by round.So I think you get my answer indirectly till now.They may ask you about your two years gap in HR round .If you can give a strong reason ,then your gaps won't matter.GOOD LUCK!!! 

Dear aspirant.........,

Well, continuous career has become compulsory for getting hired by reputed companies like TCS, WIPRO, AMAZON or even GOOGLE. So even if you got a very good seat in a reputed college, but you may not get hired by Google as they may reject your application at the time of placement. But there is always a hope and your further achievements can really help you to get hired in a reputed firm like GOOGLE.

hope this helps you out.......

Best of luck:)

See google is the company that doesn't have any criteria of selection.what google focuses on is your basics and your skill.no matter from where you have done your btech what actually matters is your computing and programming skill and concepts.so don't worry whether you will get google or not do focus on building your concepts and skill that would help you to get best of your desires.