Update obmc counts in multithread mode

Change-Id: I0743e00dad9d36a87870c480922f5ae904bd5c9d

vp10/common/thread_common.c

@@ -365,6 +365,11 @@ void vp10_accumulate_frame_counts(VP10_COMMON *cm, FRAME_COUNTS *counts,
   for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
     for (j = 0; j < SWITCHABLE_FILTERS; j++)
       cm->counts.switchable_interp[i][j] += counts->switchable_interp[i][j];
+#if CONFIG_OBMC
+  for (i = 0; i < BLOCK_SIZES; i++)
+    for (j = 0; j < 2; j++)
+      cm->counts.obmc[i][j] += counts->obmc[i][j];
+#endif  // CONFIG_OBMC
 
 #if CONFIG_REF_MV
   for (i = 0; i < NEWMV_MODE_CONTEXTS; ++i)