Congrats on passing the Google cert! Unfortunately, taking a test DOES NOT count for CPE credit. CPE means "continuing professional education".... that is activities that increase the amount or quality of knowledge you have. Taking a test demonstrates knowledge, but in and of itself, does not count as "learning".
Although this seems like a dark cloud, there is a substantial silver lining. Studying for a cert IS continuing education and one generally spends many more hours studying than sitting for an exam. So, estimate how many hours you spent studying and how many of those hours align with one or more of the CISSP domains. Then submit that number.
You should enter the CPEs individually per book, webinar, classroom time, etc. In addition to keeping the record believable and audit-able, it also keeps you from bumping into various limits.
Also, since the CPE is for the studying, it really does not matter if you passed, failed or did not even take the exam.
