Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

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

Index: third_party/harfbuzz-ng/src/hb-icu.h
diff --git a/third_party/harfbuzz-ng/src/hb-icu.h b/third_party/harfbuzz-ng/src/hb-icu.h
index cc17af8bbbc9b05fdec0c0e9d30d5b4e290baa41..ecabec29fb695e9e4e45bdbbb82d80b23f4b90a5 100644
--- a/third_party/harfbuzz-ng/src/hb-icu.h
+++ b/third_party/harfbuzz-ng/src/hb-icu.h
@@ -1,5 +1,6 @@
 /*
- * Copyright (C) 2009  Red Hat, Inc.
+ * Copyright © 2009  Red Hat, Inc.
+ * Copyright © 2011  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -22,16 +23,26 @@
  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
  * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
  */
 
 #ifndef HB_ICU_H
 #define HB_ICU_H
 
 #include "hb.h"
+#include <unicode/uscript.h>
+
 
 HB_BEGIN_DECLS
 
 
+hb_script_t
+hb_icu_script_to_script (UScriptCode script);
+
+UScriptCode
+hb_icu_script_from_script (hb_script_t script);
+
+
 hb_unicode_funcs_t *
 hb_icu_get_unicode_funcs (void);