I agree, though, that Google has somewhat more of an incentive to build stuff cross platform than Apple does. Google wants you to access their services from any device, while Apple makes almost all their money from the devices themselves.
Though that's probably not really worth that much since they're a close second, unlike everyone else.
It mostly sounds like they got sick of writing the same app twice internally though, which I could definitely see happening to people who just want to ship product and aren't platform partisans (it would be a bit weird to me for iOS partisans to go work at google?).
They don't care if you are on Android or on mobile web, so cannibalization here isn't an issue; both lead to Google searches.
Now, it might get momentum and eventually get more attention and more resources from Google leadership; but it also might not.
Ah, the problem with generalizations about large companies. http://flutter.io/, by Google.