Add new buttons for video calls.

These are simply hidden for now; behavior needs to be wired up still.
Since it now has so many buttons, I also tried to update and clean
up the comments/arrangement of buttons in call_button_fragment.

Bug: 16014280
Change-Id: If0780bab9de1889d9c4350ffc345c7239cfcc948
7 files changed
tree: 58545b4b211842777e5364c8946a410bb662f7f1
  1. InCallUI/