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Add rate_ctrl flag

BDRate Changes (negative means improvement)
lowres: 0.565%
midres: 0.361%
lowres: 0.233%
ugc360: -0.242%

Make gop size independent from coding results

Change-Id: I1f54c48b12dc45ee5162ca2527a877c1610528bd

--- a/configure

+++ b/configure

@@ -272,6 +272,7 @@

     fp_mb_stats

     emulate_hardware

     non_greedy_mv

+    rate_ctrl

 "

 CONFIG_LIST="

     dependency_tracking

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -2580,6 +2580,21 @@

     const FRAME_INFO *frame_info, const RATE_CONTROL *rc, int arf_active_or_kf,

     int gf_start_show_idx, int active_worst_quality, int last_boosted_qindex) {

   RANGE active_gf_interval;

+#if CONFIG_RATE_CTRL

+  (void)frame_info;

+  (void)gf_start_show_idx;

+  (void)active_worst_quality;

+  (void)last_boosted_qindex;

+  active_gf_interval.min = rc->min_gf_interval + arf_active_or_kf + 2;

+

+  active_gf_interval.max = 16 + arf_active_or_kf;

+

+  if ((active_gf_interval.max <= rc->frames_to_key) &&

+      (active_gf_interval.max >= (rc->frames_to_key - rc->min_gf_interval))) {

+    active_gf_interval.min = rc->frames_to_key / 2;

+    active_gf_interval.max = rc->frames_to_key / 2;

+  }

+#else

   int int_max_q = (int)(vp9_convert_qindex_to_q(active_worst_quality,

                                                 frame_info->bit_depth));

   int q_term = (gf_start_show_idx == 0)

@@ -2617,6 +2632,7 @@

   }

   active_gf_interval.max =

       VPXMAX(active_gf_interval.max, active_gf_interval.min);

+#endif

   return active_gf_interval;

 }