Render Unicode control characters

third_party/WebKit/Source/platform/text/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 78 matching lines @@
             || c == tabulationCharacter
             || c == newlineCharacter
             || c == noBreakSpaceCharacter;
     }
     static bool treatAsZeroWidthSpace(UChar32 c)
     {
         return treatAsZeroWidthSpaceInComplexScript(c)
             || c == zeroWidthNonJoinerCharacter
             || c == zeroWidthJoinerCharacter;
     }
-    static bool treatAsZeroWidthSpaceInComplexScript(UChar32 c)
+    static bool legacyTreatAsZeroWidthSpaceInComplexScript(UChar32 c)
     {
         return c < 0x20 // ASCII Control Characters
             || (c >= 0x7F && c < 0xA0) // ASCII Delete .. No-break spaceCharacter
+            || treatAsZeroWidthSpaceInComplexScript(c);
+    }
+    static bool treatAsZeroWidthSpaceInComplexScript(UChar32 c)
+    {
+        return c == formFeedCharacter
+            || c == carriageReturnCharacter

[kojii, 2016/05/19 03:44:59]

|| c == noBreakSpaceCharacter
? 0xA0 should not be legacy.

             || c == softHyphenCharacter
             || c == zeroWidthSpaceCharacter
             || (c >= leftToRightMarkCharacter && c <= rightToLeftMarkCharacter)
             || (c >= leftToRightEmbedCharacter && c <= rightToLeftOverrideCharacter)
             || c == zeroWidthNoBreakSpaceCharacter
             || c == objectReplacementCharacter;
     }
     static bool canReceiveTextEmphasis(UChar32);
 
     static bool isGraphemeExtended(UChar32 c)
@@ skipping 42 matching lines @@
 
     static String normalizeSpaces(const LChar*, unsigned length);
     static String normalizeSpaces(const UChar*, unsigned length);
 
     static bool isCommonOrInheritedScript(UChar32);
 };
 
 } // namespace blink
 
 #endif