Add support for CSS unicod encoding to the text codec.

third_party/WebKit/Source/wtf/text/TextCodec.cpp

 /*
  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
  *
  * 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
@@ skipping 29 matching lines @@
     case QuestionMarksForUnencodables:
         replacement[0] = '?';
         replacement[1] = 0;
         return 1;
     case EntitiesForUnencodables:
         snprintf(replacement, sizeof(UnencodableReplacementArray), "&#%u;", codePoint);
         return static_cast<int>(strlen(replacement));
     case URLEncodedEntitiesForUnencodables:
         snprintf(replacement, sizeof(UnencodableReplacementArray), "%%26%%23%u%%3B", codePoint);
         return static_cast<int>(strlen(replacement));
+
+    case CSSEncodedEntitiesForUnencodables:
+        snprintf(replacement, sizeof(UnencodableReplacementArray), "\\%x ", codePoint);
+        return static_cast<int>(strlen(replacement));
     }
     ASSERT_NOT_REACHED();
     replacement[0] = 0;
     return 0;
 }
 
 } // namespace WTF