Film Mode: Bias based on sub block energy.
Film Mode: Bias based on sub block energy.

Apply a bias for film mode against intra coding
(especially DC_PRED) and compound modes if the sub
blocks of the current block have significantly different
variance in the source.

Change-Id: Iac1fc0510141be5c472a0ec57567bab3d2fc4164

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