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Speed 5: use non-rd mode for key frame coding.

Metrics on RTC set go down by ~1.5% on average.
Key frame encoding time goes down by factor of ~5.

Change-Id: Ia83acc55848613870e5ac6efe7f3d904d877febb

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -301,7 +301,7 @@

         (frames_since_key % (sf->last_partitioning_redo_frequency << 1) == 1);

     sf->max_delta_qindex = is_keyframe ? 20 : 15;

     sf->partition_search_type = REFERENCE_PARTITION;

-    sf->use_nonrd_pick_mode = !is_keyframe;

+    sf->use_nonrd_pick_mode = 1;

     sf->allow_skip_recode = 0;

     sf->inter_mode_mask[BLOCK_32X32] = INTER_NEAREST_NEW_ZERO;

     sf->inter_mode_mask[BLOCK_32X64] = INTER_NEAREST_NEW_ZERO;