vp9/10: set color_space on preview frame

Change-Id: If9176ce6ed3eb6c7ef8ffd1378456cb95b4aeb86

vp10/encoder/encoder.c

@@ -3622,6 +3622,7 @@ static void encode_frame_to_data_rate(VP10_COMP *cpi,
     cpi->refresh_last_frame = 1;
 
   cm->frame_to_show = get_frame_new_buffer(cm);
+  cm->frame_to_show->color_space = cm->color_space;
 
   // Pick the loop filter level for the frame.
   loopfilter_frame(cpi, cm);

vp9/encoder/vp9_encoder.c

@@ -3807,6 +3807,7 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
     cpi->refresh_last_frame = 1;
 
   cm->frame_to_show = get_frame_new_buffer(cm);
+  cm->frame_to_show->color_space = cm->color_space;
 
   // Pick the loop filter level for the frame.
   loopfilter_frame(cpi, cm);