Enable HBD support in real time encoding path
Enable HBD support in real time encoding path

BUG=webm:1223

Change-Id: If83a613784e3b2a33c9c93f9ad0ba39dd4d23056

ShiftMediaProject/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,webmproject/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,Topopiccione/libvpx,webmproject/libvpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,Topopiccione/libvpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,webmproject/libvpx,Topopiccione/libvpx,webmproject/libvpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/vpx,Topopiccione/libvpx,webmproject/libvpx,webmproject/libvpx