Hi,
I tested this quick and it seems to be like you said.
It was not like that before, i am quite sure.
You have to touch the screen to start a next video.
Very anoying.
I hope it is a bug but I think is google business plan to exclude other vr things to push the people to go app and gear vr.
At least a killer bug which makes webbased 360 video on android phone completely useless, when you want to do something more then just one video.
So don't buy an android i would say.
But iphone also makes a mess with all those bugs.. So maybe go back to analoque or... Beam me up scotty!
Tuur
Edit. This is also the problem without vr