Cherry pick: VP8: For high overshoot, force drop frame and max-out QP.

source/libvpx/vp8/vp8_cx_iface.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 181 matching lines @@
     RANGE_CHECK_HI(vp8_cfg, noise_sensitivity,  6);
 #endif
 
     RANGE_CHECK(vp8_cfg, token_partitions,   VP8_ONE_TOKENPARTITION,
                 VP8_EIGHT_TOKENPARTITION);
     RANGE_CHECK_HI(vp8_cfg, Sharpness,       7);
     RANGE_CHECK(vp8_cfg, arnr_max_frames, 0, 15);
     RANGE_CHECK_HI(vp8_cfg, arnr_strength,   6);
     RANGE_CHECK(vp8_cfg, arnr_type,       1, 3);
     RANGE_CHECK(vp8_cfg, cq_level, 0, 63);
-    RANGE_CHECK_BOOL(vp8_cfg, screen_content_mode);
+    RANGE_CHECK_HI(vp8_cfg, screen_content_mode, 2);
     if (finalize && (cfg->rc_end_usage == VPX_CQ || cfg->rc_end_usage == VPX_Q))
         RANGE_CHECK(vp8_cfg, cq_level,
                     cfg->rc_min_quantizer, cfg->rc_max_quantizer);
 
 #if !(CONFIG_REALTIME_ONLY)
     if (cfg->g_pass == VPX_RC_LAST_PASS)
     {
         size_t           packet_sz = sizeof(FIRSTPASS_STATS);
         int              n_packets = (int)(cfg->rc_twopass_stats_in.sz /
                                           packet_sz);
@@ skipping 1175 matching lines @@
         1,                  /* 1 cfg map */
         vp8e_usage_cfg_map, /* vpx_codec_enc_cfg_map_t    cfg_maps; */
         vp8e_encode,        /* vpx_codec_encode_fn_t      encode; */
         vp8e_get_cxdata,    /* vpx_codec_get_cx_data_fn_t   get_cx_data; */
         vp8e_set_config,
         NULL,
         vp8e_get_preview,
         vp8e_mr_alloc_mem,
     } /* encoder functions */
 };