Add high bitdepth intra prediction optimization speed test
Add high bitdepth intra prediction optimization speed test

BUG=webm:1316

Change-Id: I99feec867d5b8ea06b43cdd3fcd7c90238f5efdb

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