Update from https://crrev.com/316786

third_party/harfbuzz-ng/src/hb-utf-private.hh

Index: third_party/harfbuzz-ng/src/hb-utf-private.hh
diff --git a/third_party/harfbuzz-ng/src/hb-utf-private.hh b/third_party/harfbuzz-ng/src/hb-utf-private.hh
index 0b798a05c30c5ea1fc0931aa13b44085c7a7f403..14d3c2e369b97e1241d16dee3e538750a37dd4b5 100644
--- a/third_party/harfbuzz-ng/src/hb-utf-private.hh
+++ b/third_party/harfbuzz-ng/src/hb-utf-private.hh
@@ -29,14 +29,11 @@
 
 #include "hb-private.hh"
 
-template <typename T, bool validate=true> struct hb_utf_t;
 
-
-/* UTF-8 */
-
-template <>
-struct hb_utf_t<uint8_t, true>
+struct hb_utf8_t
 {
+  typedef uint8_t codepoint_t;
+
   static inline const uint8_t *
   next (const uint8_t *text,
 	const uint8_t *end,
@@ -131,11 +128,10 @@ struct hb_utf_t<uint8_t, true>
 };
 
 
-/* UTF-16 */
-
-template <>
-struct hb_utf_t<uint16_t, true>
+struct hb_utf16_t
 {
+  typedef uint16_t codepoint_t;
+
   static inline const uint16_t *
   next (const uint16_t *text,
 	const uint16_t *end,
@@ -204,11 +200,11 @@ struct hb_utf_t<uint16_t, true>
 };
 
 
-/* UTF-32 */
-
-template <bool validate>
-struct hb_utf_t<uint32_t, validate>
+template <bool validate=true>
+struct hb_utf32_t
 {
+  typedef uint32_t codepoint_t;
+
   static inline const uint32_t *
   next (const uint32_t *text,
 	const uint32_t *end HB_UNUSED,
@@ -246,4 +242,37 @@ struct hb_utf_t<uint32_t, validate>
 };
 
 
+struct hb_latin1_t
+{
+  typedef uint8_t codepoint_t;
+
+  static inline const uint8_t *
+  next (const uint8_t *text,
+	const uint8_t *end HB_UNUSED,
+	hb_codepoint_t *unicode,
+	hb_codepoint_t replacement HB_UNUSED)
+  {
+    *unicode = *text++;
+    return text;
+  }
+
+  static inline const uint8_t *
+  prev (const uint8_t *text,
+	const uint8_t *start HB_UNUSED,
+	hb_codepoint_t *unicode,
+	hb_codepoint_t replacement)
+  {
+    *unicode = *--text;
+    return text;
+  }
+
+  static inline unsigned int
+  strlen (const uint8_t *text)
+  {
+    unsigned int l = 0;
+    while (*text++) l++;
+    return l;
+  }
+};
+
 #endif /* HB_UTF_PRIVATE_HH */