CallButtons: Prevent FRP bypass via the video calling option

When OOBE is open, phone calls can be placed to the device.
The incall dialog feature to change to a video call is exploitable
via the dialogs that it creates.

Check to ensure that the device is provisioned by us before showing
this button.

Change-Id: I49db4df359118a8ea4194b94abf9024fd32064d5
1 file changed
tree: 1b44a29d446acc86e249dbeeeb466b4e7f3650fa
  1. res/
  2. src/
  3. tests/
  4. .gitreview
  5. proguard.flags