Roll HarfBuzz to 1.4.1

third_party/harfbuzz-ng/src/hb-ot-layout.h

Index: third_party/harfbuzz-ng/src/hb-ot-layout.h
diff --git a/third_party/harfbuzz-ng/src/hb-ot-layout.h b/third_party/harfbuzz-ng/src/hb-ot-layout.h
index eb23d45b68aabd24538b46bb482ac187c5f61d73..9861f0fc7bb7f015b88b1dfce28bd031817877f2 100644
--- a/third_party/harfbuzz-ng/src/hb-ot-layout.h
+++ b/third_party/harfbuzz-ng/src/hb-ot-layout.h
@@ -95,6 +95,7 @@ hb_ot_layout_get_ligature_carets (hb_font_t      *font,
 #define HB_OT_LAYOUT_NO_SCRIPT_INDEX		0xFFFFu
 #define HB_OT_LAYOUT_NO_FEATURE_INDEX		0xFFFFu
 #define HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX	0xFFFFu
+#define HB_OT_LAYOUT_NO_VARIATIONS_INDEX	0xFFFFFFFFu
 
 HB_EXTERN unsigned int
 hb_ot_layout_table_get_script_tags (hb_face_t    *face,
@@ -236,6 +237,24 @@ Xhb_ot_layout_lookup_enumerate_sequences (hb_face_t    *face,
 					 void         *user_data);
 #endif
 
+/* Variations support */
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_table_find_feature_variations (hb_face_t    *face,
+					    hb_tag_t      table_tag,
+					    const int    *coords,
+					    unsigned int  num_coords,
+					    unsigned int *variations_index /* out */);
+
+HB_EXTERN unsigned int
+hb_ot_layout_feature_with_variations_get_lookups (hb_face_t    *face,
+						  hb_tag_t      table_tag,
+						  unsigned int  feature_index,
+						  unsigned int  variations_index,
+						  unsigned int  start_offset,
+						  unsigned int *lookup_count /* IN/OUT */,
+						  unsigned int *lookup_indexes /* OUT */);
+
 
 /*
  * GSUB