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vp9: Scene cut/content change detection: Adjust gf update.

For 1 pass vbr mode: Increase the period of gf update on scene
cut (keep it same as orginal/default setting for now).

Change-Id: I679c3bd21152f6c4e486c8098d931c00e1d26b5f

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

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

@@ -2065,7 +2065,7 @@

         cpi->ext_refresh_frame_flags_pending == 0) {

       int target;

       cpi->refresh_golden_frame = 1;

-      rc->frames_till_gf_update_due = rc->baseline_gf_interval >> 1;

+      rc->frames_till_gf_update_due = rc->baseline_gf_interval;

       if (rc->frames_till_gf_update_due > rc->frames_to_key)

         rc->frames_till_gf_update_due = rc->frames_to_key;

       rc->gfu_boost = DEFAULT_GF_BOOST;