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vp9-rtc: Reduce thresholds for skip golden

For nonrd-pickmode CBR mode: reduce the skip
golden ref thresholds, to reduce some psnr
regression in some clips, while still effectively
reducing flashing block artifact occurrence.

Change-Id: I468dcf5354411aeb54ac3ef56c6fb73267d93fde

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

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

@@ -1699,7 +1699,7 @@

   int svc_mv_row = 0;

   int no_scaling = 0;

   unsigned int thresh_svc_skip_golden = 500;

-  unsigned int thresh_skip_golden = (bsize >= BLOCK_32X32) ? 5000 : 1000;

+  unsigned int thresh_skip_golden = (bsize >= BLOCK_32X32) ? 2500 : 500;

   int scene_change_detected =

       cpi->rc.high_source_sad ||

       (cpi->use_svc && cpi->svc.high_source_sad_superframe);