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vp9-rtc: Update overshoot_detection speed feature

Keep the overshoot_detection_cbr_rt to the fast mode
(FAST_DETECTION_MAXQ), except for low-resoln at speed 5,
for non-screen content.

The increase in encode time (from using the more accurate
RE_ENCODE_MAXQ) is acceptable for speed 5 at low resoln.

Change-Id: I3089d1505553154ef046056465bc18130f7bd55a

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

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

@@ -618,8 +618,13 @@

     // increase in encoding time.

     if (cpi->use_svc && svc->spatial_layer_id > 0) sf->nonrd_keyframe = 1;

     if (cm->frame_type != KEY_FRAME && cpi->resize_state == ORIG &&

-        cpi->oxcf.rc_mode == VPX_CBR)

-      sf->overshoot_detection_cbr_rt = FAST_DETECTION_MAXQ;

+        cpi->oxcf.rc_mode == VPX_CBR) {

+      if (cm->width * cm->height <= 352 * 288 && !cpi->use_svc &&

+          cpi->oxcf.content != VP9E_CONTENT_SCREEN)

+        sf->overshoot_detection_cbr_rt = RE_ENCODE_MAXQ;

+      else

+        sf->overshoot_detection_cbr_rt = FAST_DETECTION_MAXQ;

+    }

     if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0 &&

         cm->width <= 1280 && cm->height <= 720) {

       sf->use_altref_onepass = 1;

@@ -660,6 +665,9 @@

       sf->limit_newmv_early_exit = 0;

       sf->base_mv_aggressive = 1;

     }

+    if (cm->frame_type != KEY_FRAME && cpi->resize_state == ORIG &&

+        cpi->oxcf.rc_mode == VPX_CBR)

+      sf->overshoot_detection_cbr_rt = FAST_DETECTION_MAXQ;

   }

   if (speed >= 7) {