text-justify fix for Chinese and Japanese

Source/platform/fonts/Character.cpp

 /*
  * 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 360 matching lines @@
             UChar32 character = characters[i];
             if (treatAsSpace(character)) {
                 count++;
                 isAfterExpansion = true;
                 continue;
             }
             if (U16_IS_LEAD(character) && i + 1 < length && U16_IS_TRAIL(characters[i + 1])) {
                 character = U16_GET_SUPPLEMENTARY(character, characters[i + 1]);
                 i++;
             }
+            if (textJustify == TextJustify::TextJustifyAuto && isCJKIdeographOrSymbol(character)) {
+                if (!isAfterExpansion)
+                    count++;
+                count++;
+                isAfterExpansion = true;
+                continue;
+            }
             isAfterExpansion = false;
         }
     } else {
         for (size_t i = length; i > 0; --i) {
             UChar32 character = characters[i - 1];
             if (treatAsSpace(character)) {
                 count++;
                 isAfterExpansion = true;
                 continue;
             }
             if (U16_IS_TRAIL(character) && i > 1 && U16_IS_LEAD(characters[i - 2])) {
                 character = U16_GET_SUPPLEMENTARY(characters[i - 2], character);
                 i--;
             }
+            if (textJustify == TextJustify::TextJustifyAuto && isCJKIdeographOrSymbol(character)) {
+                if (!isAfterExpansion)
+                    count++;
+                count++;
+                isAfterExpansion = true;
+                continue;
+            }
             isAfterExpansion = false;
         }
     }
     return count;
 }
 
 bool Character::canReceiveTextEmphasis(UChar32 c)
 {
     CharCategory category = Unicode::category(c);
     if (category & (Separator_Space | Separator_Line | Separator_Paragraph | Other_NotAssigned | Other_Control | Other_Format))
@@ skipping 23 matching lines @@
 {
     return normalizeSpacesInternal(characters, length);
 }
 
 String Character::normalizeSpaces(const UChar* characters, unsigned length)
 {
     return normalizeSpacesInternal(characters, length);
 }
 
 } // namespace blink