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vp9: Use nonrd_pick_partition on scene-cut, for speed 5 vbr mode.

On scene-cut detected frames (i.e., high_source_sad = 1), use
nonrd_pick_partition (over choose_part + select_part), as
the nonrd_pick partitioning is generally better.

Small positive increase in metrics on ytlive set (~0.5 - 1%).
Negligle overall speed decrease, as its only used on scene-cut frames.

Only affects 1 pass vbr mode, speed = 5.

Change-Id: I07c89cbdc75f5bb16eb8e0e2773ead0980d2de5c

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -3797,8 +3797,14 @@

         break;

       case REFERENCE_PARTITION:

         set_offsets(cpi, tile_info, x, mi_row, mi_col, BLOCK_64X64);

-        if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled &&

-            xd->mi[0]->segment_id) {

+        // Use nonrd_pick_partition on scene-cut for VBR, or on qp-segment

+        // if cyclic_refresh is enabled.

+        // nonrd_pick_partition does not support 4x4 partition, so avoid it

+        // on key frame for now.

+        if ((cpi->oxcf.rc_mode == VPX_VBR && cpi->rc.high_source_sad &&

+            cm->frame_type != KEY_FRAME) ||

+            (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled &&

+            xd->mi[0]->segment_id)) {

           // Use lower max_partition_size for low resoultions.

           if (cm->width <= 352 && cm->height <= 288)

             x->max_partition_size = BLOCK_32X32;