Kathleen,
There is already very simple App that looks like Scratch called Hopscotch for the iPad. So, how are they getting Scratch on Chromebooks and iPads?
Note that Scratch 2.0 (being released right now) uses Flash, so it won't run on iPads. I would guess that Chromebooks wouldn't have any problems with it, but am not sure. But there is a version in Javascript, called Snap!, that works just fine on all these machines.
It is beginning to seem more urgent that Etoys adapt to these new rather closed box machines.
Etoys has been adapted, but isn't allowed by Apple to be distributed to its users.
-- Jecel