Enable Emoji Fitzpatrick modifier sequences

third_party/WebKit/Source/platform/fonts/shaping/CachingWordShapeIterator.h

 /*
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 109 matching lines @@
         // Delimit every CJK character because these scripts do not delimit
         // words by spaces, and not delimiting hits the performance.
         if (!m_textRun.is8Bit()) {
             UChar32 ch;
             unsigned end = m_startIndex;
             U16_NEXT(m_textRun.characters16(), end, length, ch);
             if (Character::isCJKIdeographOrSymbol(ch)) {
                 bool hasAnyScript = !Character::isCommonOrInheritedScript(ch);
                 for (unsigned i = end; i < length; end = i) {
                     U16_NEXT(m_textRun.characters16(), i, length, ch);
-                    // ZWJ check in order not to split Emoji ZWJ sequences.
+                    // ZWJ and modifier check in order not to split those Emoji sequences.
                     if (U_GET_GC_MASK(ch) & (U_GC_M_MASK | U_GC_LM_MASK | U_GC_SK_MASK)
-                        || ch == zeroWidthJoinerCharacter)
+                        || ch == zeroWidthJoinerCharacter || Character::isModifier(ch))
                         continue;
                     // Avoid delimiting COMMON/INHERITED alone, which makes harder to
                     // identify the script.
                     if (Character::isCJKIdeographOrSymbol(ch)) {
                         if (Character::isCommonOrInheritedScript(ch))
                             continue;
                         if (!hasAnyScript) {
                             hasAnyScript = true;
                             continue;
                         }
@@ skipping 76 matching lines @@
     const Font* m_font;
     float m_widthSoFar; // Used only when allowTabs()
     unsigned m_startIndex : 30;
     unsigned m_wordResultCachable : 1;
     unsigned m_shapeByWord : 1;
 };
 
 } // namespace blink
 
 #endif // CachingWordShapeIterator_h