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vp9: SVC: Skip NEWMV for small blocks for (0, 0) base_mv.

For SVC encoding:
average speedup ~1.5%, with small ~0.57 loss in avgPSNR metrics.

Change-Id: Icebce6f6ef4e819d7dfcf8db898c583167351de4

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1805,6 +1805,14 @@

               (frame_mv[NEWMV][ref_frame].as_mv.col >> 3);

           cpi->fn_ptr[bsize].vf(x->plane[0].src.buf, x->plane[0].src.stride,

                                 pre_buf, pre_stride, &base_mv_sse);

+

+          // Exit NEWMV search if base_mv is (0,0) && bsize < BLOCK_16x16,

+          // for SVC encoding.

+          if (cpi->use_svc && cpi->svc.use_base_mv && bsize < BLOCK_16X16 &&

+              frame_mv[NEWMV][ref_frame].as_mv.row == 0 &&

+              frame_mv[NEWMV][ref_frame].as_mv.col == 0)

+            continue;

+

           // Exit NEWMV search if base_mv_sse is large.

           if (sf->base_mv_aggressive && base_mv_sse > (best_sse_sofar << scale))

             continue;