Unicode Variation Selectors support in collectCandidateRuns

Source/platform/fonts/Character.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 class PLATFORM_EXPORT Character {
 public:
     static CodePath characterRangeCodePath(const LChar*, unsigned) { return SimplePath; }
     static CodePath characterRangeCodePath(const UChar*, unsigned len);
 
     static inline bool isInRange(UChar32 character, UChar32 lowerBound, UChar32 upperBound)
     {
         return character >= lowerBound && character <= upperBound;
     }
 
+    static inline bool isUnicodeVariationSelector(UChar32 character)
+    {
+        // http://www.unicode.org/Public/UCD/latest/ucd/StandardizedVariants.html
+        return isInRange(character, 0x180B, 0x180D) // MONGOLIAN FREE VARIATION SELECTOR ONE to THREE
+            || isInRange(character, 0xFE00, 0xFE0F) // VARIATION SELECTOR-1 to 16
+            || isInRange(character, 0xE0100, 0xE01EF); // VARIATION SELECTOR-17 to 256
+    }
+
     static bool isCJKIdeograph(UChar32);
     static bool isCJKIdeographOrSymbol(UChar32);
 
     static unsigned expansionOpportunityCount(const LChar*, size_t length, TextDirection, bool& isAfterExpansion, const TextJustify);
     static unsigned expansionOpportunityCount(const UChar*, size_t length, TextDirection, bool& isAfterExpansion, const TextJustify);
 
     static bool shouldIgnoreRotation(UChar32 character);
 
     static bool treatAsSpace(UChar c)
     {
@@ skipping 46 matching lines @@
     static String normalizeSpaces(const LChar*, unsigned length);
     static String normalizeSpaces(const UChar*, unsigned length);
 
 private:
     Character();
 };
 
 } // namespace blink
 
 #endif