ext_intra_mod: average angle_delta_cdf

BUG=aomedia:1026

Change-Id: If1b62c728bb77ca733aaa5b9100608f6b9d33db1

av1/common/entropy.c

diff --git a/av1/common/entropy.c b/av1/common/entropy.c
index 806bf2b..3b15c5f 100644
--- a/av1/common/entropy.c
+++ b/av1/common/entropy.c
@@ -1743,6 +1743,9 @@
 #endif  // CONFIG_MRC_TX
   AVERAGE_TILE_CDFS(palette_y_mode_cdf)
   AVERAGE_TILE_CDFS(palette_uv_mode_cdf)
+#if CONFIG_EXT_INTRA_MOD
+  AVERAGE_TILE_CDFS(angle_delta_cdf)
+#endif  // CONFIG_EXT_INTRA_MOD
 #if CONFIG_LPF_SB
   AVERAGE_TILE_CDFS(lpf_reuse_cdf);
   AVERAGE_TILE_CDFS(lpf_delta_cdf);