Spinners don't work with GVRViews

[rahul27]

This is what happens when I add a spinner to GVRView:

[rahul27]

Here is a modified sample that recreates the problem:

https://github.com/rahul27/GearVRf-Demos/commit/a5ac597004fe96abaf793f79d07afe0ec6979422

[liaxim]

I wonder whether this is related to the more general issue raised in https://github.com/Samsung/GearVRf/issues/467 about supporting dialogs. I guess we can start by investigating this particular case and then dialogs in general.