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vp9: Compute source sad for every superblock when partition copy is on.

The source sad could be used to copy the partition without going into
choose_partitioning function to speed up vp9 encoding. Computing source
sad takes little time. Speed test on Android and Linux shows little
encoding time gain (less than 1.4%).

Turned off for now since partition copy is turned off.

Change-Id: I61c9d5b8f22329760cb29a4ee30a7f9c232ce8d3

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -3133,7 +3133,7 @@

   if (cpi->oxcf.pass == 0 && cpi->oxcf.mode == REALTIME &&

       cpi->oxcf.speed >= 5 && cpi->resize_state == 0 &&

       (cpi->oxcf.content == VP9E_CONTENT_SCREEN ||

-       cpi->oxcf.rc_mode == VPX_VBR) &&

+       cpi->oxcf.rc_mode == VPX_VBR || cpi->sf.copy_partition_flag) &&

       cm->show_frame)

     vp9_avg_source_sad(cpi);

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -2251,10 +2251,12 @@

         for (sbi_row = 0; sbi_row < sb_rows; ++sbi_row) {

           for (sbi_col = 0; sbi_col < sb_cols; ++sbi_col) {

             // Checker-board pattern, ignore boundary.

-            if ((sbi_row > 0 && sbi_col > 0) &&

-                (sbi_row < sb_rows - 1 && sbi_col < sb_cols - 1) &&

-                ((sbi_row % 2 == 0 && sbi_col % 2 == 0) ||

-                 (sbi_row % 2 != 0 && sbi_col % 2 != 0))) {

+            // If the partition copy is on, compute for every superblock.

+            if (cpi->sf.copy_partition_flag ||

+                ((sbi_row > 0 && sbi_col > 0) &&

+                 (sbi_row < sb_rows - 1 && sbi_col < sb_cols - 1) &&

+                 ((sbi_row % 2 == 0 && sbi_col % 2 == 0) ||

+                  (sbi_row % 2 != 0 && sbi_col % 2 != 0)))) {

               num_samples++;

               avg_sad += cpi->fn_ptr[bsize].sdf(src_y, src_ystride, last_src_y,

                                                 last_src_ystride);