Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-shape.h

Index: third_party/harfbuzz-ng/src/hb-shape.h
diff --git a/third_party/harfbuzz-ng/src/hb-shape.h b/third_party/harfbuzz-ng/src/hb-shape.h
index 48f1a557c7d88177481c8b434545faa9bd88daff..685b11d4fe969151cd1f25ede7ca53b3a2ea560c 100644
--- a/third_party/harfbuzz-ng/src/hb-shape.h
+++ b/third_party/harfbuzz-ng/src/hb-shape.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009  Red Hat, Inc.
+ * Copyright © 2009  Red Hat, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -41,12 +41,23 @@ typedef struct _hb_feature_t {
   unsigned int  end;
 } hb_feature_t;
 
+
 void
-hb_shape (hb_font_t    *font,
-	  hb_face_t    *face,
-	  hb_buffer_t  *buffer,
-	  hb_feature_t *features,
-	  unsigned int  num_features);
+hb_shape (hb_font_t           *font,
+	  hb_buffer_t         *buffer,
+	  const hb_feature_t  *features,
+	  unsigned int         num_features);
+
+hb_bool_t
+hb_shape_full (hb_font_t          *font,
+	       hb_buffer_t        *buffer,
+	       const hb_feature_t *features,
+	       unsigned int        num_features,
+	       const char * const *shaper_options,
+	       const char * const *shaper_list);
+
+const char **
+hb_shape_list_shapers (void);
 
 
 HB_END_DECLS