sync gmail calendar with icloud calendar

I use Chrome as my browser for email and my calendar. It is set up to open my gmail account and my iCloud calendar upon start and it is all I use Chrome for. I could not figure out how to get the google calendar to work with Apple so I transferred the info and use the iCloud calendar. I still consistently get a weird message about my browser level being not at 100% but it works fine and then what I do on my computer syncs with my phone, etc... I am guessing you will not get very far with trying to stick with the google calendar using apple products.