VP9: turn on tile-columns and frame-parallel-mode by default
VP9: turn on tile-columns and frame-parallel-mode by default

Most of the current decoders use tile-based multithreading. Also
most of the current decoders need frame_parallel_decoding_mode
turned on to enable multithreaded decoding. tile-columns is
limited by resolution, so setting to max (6) is fine.

BUG=https://code.google.com/p/webm/issues/detail?id=963

Change-Id: I6e7ac3485d96bf0c69e06706cbb326dd38be0020

lyx2014/libvpx_c,mbebenita/aom,kim42083/webm.libvpx,shareefalis/libvpx,Maria1099/webm.libvpx,shacklettbp/aom,jmvalin/aom,GrokImageCompression/aom,shyamalschandra/libvpx,openpeer/libvpx_new,shareefalis/libvpx,zofuthan/libvpx,thdav/aom,Suvarna1488/webm.libvpx,mwgoldsmith/vpx,kleopatra999/webm.libvpx,thdav/aom,kalli123/webm.libvpx,thdav/aom,matanbs/webm.libvpx,shyamalschandra/libvpx,kim42083/webm.libvpx,ShiftMediaProject/libvpx,stewnorriss/libvpx,ittiamvpx/libvpx-1,jacklicn/webm.libvpx,kim42083/webm.libvpx,webmproject/libvpx,Maria1099/webm.libvpx,running770/libvpx,GrokImageCompression/aom,Suvarna1488/webm.libvpx,Topopiccione/libvpx,Maria1099/webm.libvpx,mwgoldsmith/libvpx,shacklettbp/aom,shacklettbp/aom,luctrudeau/aom,running770/libvpx,Topopiccione/libvpx,reimaginemedia/webm.libvpx,kleopatra999/webm.libvpx,webmproject/libvpx,zofuthan/libvpx,VTCSecureLLC/libvpx,luctrudeau/aom,Acidburn0zzz/webm.libvpx,iniwf/webm.libvpx,GrokImageCompression/aom,liqianggao/libvpx,kleopatra999/webm.libvpx,reimaginemedia/webm.libvpx,reimaginemedia/webm.libvpx,kleopatra999/webm.libvpx,iniwf/webm.libvpx,felipebetancur/libvpx,abwiz0086/webm.libvpx,Distrotech/libvpx,felipebetancur/libvpx,felipebetancur/libvpx,liqianggao/libvpx,lyx2014/libvpx_c,VTCSecureLLC/libvpx,Topopiccione/libvpx,altogother/webm.libvpx,thdav/aom,gshORTON/webm.libvpx,jmvalin/aom,iniwf/webm.libvpx,lyx2014/libvpx_c,running770/libvpx,jacklicn/webm.libvpx,shyamalschandra/libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,altogother/webm.libvpx,zofuthan/libvpx,shacklettbp/aom,luctrudeau/aom,gshORTON/webm.libvpx,shacklettbp/aom,reimaginemedia/webm.libvpx,kalli123/webm.libvpx,ittiamvpx/libvpx-1,reimaginemedia/webm.libvpx,matanbs/webm.libvpx,kalli123/webm.libvpx,webmproject/libvpx,mwgoldsmith/libvpx,jmvalin/aom,mwgoldsmith/vpx,jacklicn/webm.libvpx,kim42083/webm.libvpx,liqianggao/libvpx,lyx2014/libvpx_c,felipebetancur/libvpx,mwgoldsmith/libvpx,Maria1099/webm.libvpx,shareefalis/libvpx,openpeer/libvpx_new,stewnorriss/libvpx,luctrudeau/aom,VTCSecureLLC/libvpx,Suvarna1488/webm.libvpx,luctrudeau/aom,Topopiccione/libvpx,Acidburn0zzz/webm.libvpx,kim42083/webm.libvpx,abwiz0086/webm.libvpx,shyamalschandra/libvpx,zofuthan/libvpx,Topopiccione/libvpx,lyx2014/libvpx_c,VTCSecureLLC/libvpx,GrokImageCompression/aom,shareefalis/libvpx,mbebenita/aom,Acidburn0zzz/webm.libvpx,matanbs/webm.libvpx,openpeer/libvpx_new,webmproject/libvpx,openpeer/libvpx_new,liqianggao/libvpx,jmvalin/aom,zofuthan/libvpx,smarter/aom,jacklicn/webm.libvpx,felipebetancur/libvpx,stewnorriss/libvpx,thdav/aom,shareefalis/libvpx,smarter/aom,stewnorriss/libvpx,jacklicn/webm.libvpx,Distrotech/libvpx,Suvarna1488/webm.libvpx,stewnorriss/libvpx,altogother/webm.libvpx,webmproject/libvpx,kleopatra999/webm.libvpx,thdav/aom,goodleixiao/vpx,altogother/webm.libvpx,iniwf/webm.libvpx,Suvarna1488/webm.libvpx,Topopiccione/libvpx,Acidburn0zzz/webm.libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,Maria1099/webm.libvpx,liqianggao/libvpx,goodleixiao/vpx,felipebetancur/libvpx,smarter/aom,lyx2014/libvpx_c,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,Maria1099/webm.libvpx,running770/libvpx,mbebenita/aom,kim42083/webm.libvpx,kalli123/webm.libvpx,abwiz0086/webm.libvpx,goodleixiao/vpx,ittiamvpx/libvpx-1,Distrotech/libvpx,mwgoldsmith/vpx,gshORTON/webm.libvpx,mwgoldsmith/libvpx,GrokImageCompression/aom,altogother/webm.libvpx,luctrudeau/aom,ittiamvpx/libvpx-1,goodleixiao/vpx,kleopatra999/webm.libvpx,kalli123/webm.libvpx,Distrotech/libvpx,kalli123/webm.libvpx,Suvarna1488/webm.libvpx,mwgoldsmith/vpx,Distrotech/libvpx,matanbs/webm.libvpx,goodleixiao/vpx,mwgoldsmith/libvpx,openpeer/libvpx_new,VTCSecureLLC/libvpx,Acidburn0zzz/webm.libvpx,smarter/aom,mbebenita/aom,ittiamvpx/libvpx-1,reimaginemedia/webm.libvpx,gshORTON/webm.libvpx,ShiftMediaProject/libvpx,jacklicn/webm.libvpx,ittiamvpx/libvpx-1,mbebenita/aom,shyamalschandra/libvpx,goodleixiao/vpx,shareefalis/libvpx,gshORTON/webm.libvpx,GrokImageCompression/aom,liqianggao/libvpx,zofuthan/libvpx,smarter/aom,iniwf/webm.libvpx,mbebenita/aom,iniwf/webm.libvpx,mwgoldsmith/vpx,Distrotech/libvpx,running770/libvpx,shacklettbp/aom,webmproject/libvpx,openpeer/libvpx_new,stewnorriss/libvpx,altogother/webm.libvpx,VTCSecureLLC/libvpx,matanbs/webm.libvpx,jmvalin/aom,mbebenita/aom,abwiz0086/webm.libvpx,jmvalin/aom,mbebenita/aom,mwgoldsmith/vpx,matanbs/webm.libvpx,smarter/aom,running770/libvpx,shyamalschandra/libvpx,gshORTON/webm.libvpx,mbebenita/aom,abwiz0086/webm.libvpx