libvpx: Pull from upstream

source/libvpx/vpxenc.c

Index: source/libvpx/vpxenc.c
===================================================================
--- source/libvpx/vpxenc.c	(revision 290053)
+++ source/libvpx/vpxenc.c	(working copy)
@@ -378,11 +378,20 @@
     NULL, "frame_boost", 1,
     "Enable frame periodic boost (0: off (default), 1: on)");
 
+static const struct arg_enum_list tune_content_enum[] = {
+  {"default", VP9E_CONTENT_DEFAULT},
+  {"screen", VP9E_CONTENT_SCREEN},
+  {NULL, 0}
+};
+
+static const arg_def_t tune_content = ARG_DEF_ENUM(
+    NULL, "tune-content", 1, "Tune content type", tune_content_enum);
+
 static const arg_def_t *vp9_args[] = {
   &cpu_used, &auto_altref, &noise_sens, &sharpness, &static_thresh,
   &tile_cols, &tile_rows, &arnr_maxframes, &arnr_strength, &arnr_type,
   &tune_ssim, &cq_level, &max_intra_rate_pct, &lossless,
-  &frame_parallel_decoding, &aq_mode, &frame_periodic_boost,
+  &frame_parallel_decoding, &aq_mode, &frame_periodic_boost, &tune_content,
   NULL
 };
 static const int vp9_arg_ctrl_map[] = {
@@ -392,7 +401,7 @@
   VP8E_SET_ARNR_MAXFRAMES, VP8E_SET_ARNR_STRENGTH, VP8E_SET_ARNR_TYPE,
   VP8E_SET_TUNING, VP8E_SET_CQ_LEVEL, VP8E_SET_MAX_INTRA_BITRATE_PCT,
   VP9E_SET_LOSSLESS, VP9E_SET_FRAME_PARALLEL_DECODING, VP9E_SET_AQ_MODE,
-  VP9E_SET_FRAME_PERIODIC_BOOST,
+  VP9E_SET_FRAME_PERIODIC_BOOST, VP9E_SET_TUNE_CONTENT,
   0
 };
 #endif