How would you rate your performance in this interview so far?
If asked this question during your interview, your interviewer at Google is looking for you to give an honest assessment of your interview to this point and to clarify if you are satisfied with your interview performance. If your interview were a flop, you would know, and it's much better to address outright your performance than try to sweep it under the rug. Conversely, if you feel your interview is going well, you can surely express your confidence to your interviewer.
"I believe that this interview has been quite informative. I am confident that our discussion has been very thorough and I'm happy with my performance. Is there anything that I can clarify for you from this conversation?"
For example: "I am not sure if I have been able to portray myself 100% accurately in this interview. I honestly was quite nervous coming in to interview for my dream job with Google. If there is anything more I can clarify for you, I would be happy to do so."
