Alter partition search at image edge.
Alter partition search at image edge.

Added code to reduce the minimum partition size searched
for super blocks at or straddling the edge of the image.

If the first pass has detected formatting bars the "active" edge
may not be the real edge.

Change-Id: I9c4bdd1477e60f162a75fac95ba6be7c3521e05c

mwgoldsmith/vpx,VTCSecureLLC/libvpx,zofuthan/libvpx,jmvalin/aom,luctrudeau/aom,liqianggao/libvpx,stewnorriss/libvpx,mwgoldsmith/libvpx,shacklettbp/aom,zofuthan/libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx-1,luctrudeau/aom,shacklettbp/aom,mwgoldsmith/libvpx,goodleixiao/vpx,smarter/aom,GrokImageCompression/aom,mbebenita/aom,shyamalschandra/libvpx,stewnorriss/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,stewnorriss/libvpx,shacklettbp/aom,GrokImageCompression/aom,felipebetancur/libvpx,felipebetancur/libvpx,goodleixiao/vpx,thdav/aom,goodleixiao/vpx,ittiamvpx/libvpx-1,liqianggao/libvpx,running770/libvpx,mbebenita/aom,running770/libvpx,shyamalschandra/libvpx,shyamalschandra/libvpx,felipebetancur/libvpx,mwgoldsmith/vpx,mbebenita/aom,mbebenita/aom,stewnorriss/libvpx,mbebenita/aom,mwgoldsmith/libvpx,luctrudeau/aom,shacklettbp/aom,liqianggao/libvpx,VTCSecureLLC/libvpx,Topopiccione/libvpx,shacklettbp/aom,webmproject/libvpx,thdav/aom,stewnorriss/libvpx,jmvalin/aom,goodleixiao/vpx,mwgoldsmith/libvpx,thdav/aom,goodleixiao/vpx,running770/libvpx,webmproject/libvpx,zofuthan/libvpx,running770/libvpx,GrokImageCompression/aom,openpeer/libvpx_new,zofuthan/libvpx,ittiamvpx/libvpx-1,liqianggao/libvpx,Topopiccione/libvpx,webmproject/libvpx,mwgoldsmith/libvpx,GrokImageCompression/aom,openpeer/libvpx_new,shyamalschandra/libvpx,liqianggao/libvpx,luctrudeau/aom,thdav/aom,shyamalschandra/libvpx,VTCSecureLLC/libvpx,felipebetancur/libvpx,luctrudeau/aom,jmvalin/aom,felipebetancur/libvpx,smarter/aom,smarter/aom,mwgoldsmith/vpx,GrokImageCompression/aom,goodleixiao/vpx,openpeer/libvpx_new,liqianggao/libvpx,Topopiccione/libvpx,VTCSecureLLC/libvpx,smarter/aom,smarter/aom,shacklettbp/aom,smarter/aom,openpeer/libvpx_new,webmproject/libvpx,thdav/aom,ittiamvpx/libvpx-1,Topopiccione/libvpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,running770/libvpx,GrokImageCompression/aom,VTCSecureLLC/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,luctrudeau/aom,mbebenita/aom,VTCSecureLLC/libvpx,zofuthan/libvpx,jmvalin/aom,zofuthan/libvpx,ShiftMediaProject/libvpx,shyamalschandra/libvpx,openpeer/libvpx_new,mwgoldsmith/libvpx,mwgoldsmith/vpx,Topopiccione/libvpx,jmvalin/aom,thdav/aom,mbebenita/aom,mbebenita/aom,running770/libvpx,openpeer/libvpx_new,ittiamvpx/libvpx-1,felipebetancur/libvpx,stewnorriss/libvpx,ittiamvpx/libvpx-1,mbebenita/aom,webmproject/libvpx,ShiftMediaProject/libvpx,jmvalin/aom