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VP9: Allow for bilinear subpel interp at speed 9 for high motion.

Fixed some settings in nonrd pick mode to allow for frame-level bilinear
to be set.
On Galaxy S8+ it has 4% speed up on high motion clips. Almost the same
for low motion.

0.17% quality loss on RTC.

Change-Id: I044a7de020183754ba08bb6c96c5a78ba5c7fea2

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

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

@@ -1340,6 +1340,7 @@

     mi->ref_frame[1] = NONE;

     mi->mv[0].as_int = 0;

     mi->interp_filter = EIGHTTAP;

+    if (cpi->sf.default_interp_filter == BILINEAR) mi->interp_filter = BILINEAR;

     xd->plane[0].pre[0] = yv12_mb[LAST_FRAME][0];

     vp9_build_inter_predictors_sby(xd, mi_row, mi_col, bsize);

     model_rd_for_sb_y(cpi, bsize, x, xd, &rate, &dist, &var_y, &sse_y);

@@ -1512,6 +1513,10 @@

   int svc_mv_row = 0;

   int no_scaling = 0;

   unsigned int thresh_svc_skip_golden = 500;

+  if (cpi->sf.default_interp_filter == BILINEAR) {

+    best_pred_filter = BILINEAR;

+    filter_gf_svc = BILINEAR;

+  }

   if (cpi->use_svc && svc->spatial_layer_id > 0) {

     int layer =

         LAYER_IDS_TO_IDX(svc->spatial_layer_id - 1, svc->temporal_layer_id,

@@ -1562,12 +1567,13 @@

   // filter_ref, we use a less strict condition on assigning filter_ref.

   // This is to reduce the probabily of entering the flow of not assigning

   // filter_ref and then skip filter search.

-  if (xd->above_mi && is_inter_block(xd->above_mi))

-    filter_ref = xd->above_mi->interp_filter;

-  else if (xd->left_mi && is_inter_block(xd->left_mi))

-    filter_ref = xd->left_mi->interp_filter;

-  else

-    filter_ref = cm->interp_filter;

+  filter_ref = cm->interp_filter;

+  if (cpi->sf.default_interp_filter != BILINEAR) {

+    if (xd->above_mi && is_inter_block(xd->above_mi))

+      filter_ref = xd->above_mi->interp_filter;

+    else if (xd->left_mi && is_inter_block(xd->left_mi))

+      filter_ref = xd->left_mi->interp_filter;

+  }

   // initialize mode decisions

   vp9_rd_cost_reset(&best_rdc);

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -682,6 +682,7 @@

       sf->disable_16x16part_nonkey = 1;

     // Allow for disabling GOLDEN reference, for CBR mode.

     if (cpi->oxcf.rc_mode == VPX_CBR) sf->disable_golden_ref = 1;

+    if (cpi->rc.avg_frame_low_motion < 65) sf->default_interp_filter = BILINEAR;

   }

   if (sf->use_altref_onepass) {