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Set rc->high_source_sad = 0  before scene detection.

Only has effect when sf->use_altref_onepass is enabled,
as in that case scene detection is skipped for non-show frame
and so high_source_sad does not get reset to 0.

No change in metrics or speed.

Change-Id: I421f066d239341449c18826089e1810b9fc5967f

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

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

@@ -3531,6 +3531,7 @@

   // Scene detection is always used for VBR mode or screen-content case.

   // For other cases (e.g., CBR mode) use it for 5 <= speed < 8 for now

   // (need to check encoding time cost for doing this for speed 8).

+  cpi->rc.high_source_sad = 0;

   if (cpi->compute_source_sad_onepass &&

       (cpi->oxcf.rc_mode == VPX_VBR ||

        cpi->oxcf.content == VP9E_CONTENT_SCREEN ||