Rescale arf bit budget calculation
Rescale arf bit budget calculation

To compute the total budget for a depth layer, exclude the count of
frames in the current layer.

Change-Id: I9ffd1f63ea597de3ea95e0832b13f5b1f35cb086

ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx