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vp9: Add bias to last frame in choose_partitioning.

This change is only for real-time mode if short_circuit_low_temp_var
is on. Add bias to last frame in choosing ref frame for partitioning,
when y_sad and y_sad_g are close. It speeds up real-time encoding by
0.5% on some clips with less than 0.1% overall PSNR drop on rtc test set.

Change-Id: I2a2110fe36455f3d8f0fc404aef2228f512e8df8

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

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

@@ -796,7 +796,7 @@

     const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);

     const YV12_BUFFER_CONFIG *yv12_g = NULL;

-    unsigned int y_sad, y_sad_g;

+    unsigned int y_sad, y_sad_g, y_sad_thr;

     const BLOCK_SIZE bsize = BLOCK_32X32

         + (mi_col + 4 < cm->mi_cols) * 2 + (mi_row + 4 < cm->mi_rows);

@@ -829,7 +829,10 @@

     mi->interp_filter = BILINEAR;

     y_sad = vp9_int_pro_motion_estimation(cpi, x, bsize, mi_row, mi_col);

-    if (y_sad_g < y_sad) {

+    // Pick ref frame for partitioning, bias last frame when y_sad_g and y_sad

+    // are close if short_circuit_low_temp_var is on.

+    y_sad_thr = cpi->sf.short_circuit_low_temp_var ? (y_sad * 7) >> 3 : y_sad;

+    if (y_sad_g < y_sad_thr) {

       vp9_setup_pre_planes(xd, 0, yv12_g, mi_row, mi_col,

                            &cm->frame_refs[GOLDEN_FRAME - 1].sf);

       mi->ref_frame[0] = GOLDEN_FRAME;