Add support for CSS unicod encoding to the text codec.

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

 /*
  * 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 32 matching lines @@
     // Substitutes the replacement character "?".
     QuestionMarksForUnencodables,
 
     // Encodes the character as an XML entity. For example, U+06DE
     // would be "&#1758;" (0x6DE = 1758 in octal).
     EntitiesForUnencodables,
 
     // Encodes the character as en entity as above, but escaped
     // non-alphanumeric characters. This is used in URLs.
     // For example, U+6DE would be "%26%231758%3B".
-    URLEncodedEntitiesForUnencodables
+    URLEncodedEntitiesForUnencodables,
+
+    // Encodes the character as a CSS entity.  For example U+06DE
+    // would be \06de.  See: https://www.w3.org/TR/css-syntax-3/#escaping
+    CSSEncodedEntitiesForUnencodables,
 };
 
 typedef char UnencodableReplacementArray[32];
 
 enum FlushBehavior {
     // More bytes are coming, don't flush the codec.
     DoNotFlush = 0,
 
     // A fetch has hit EOF. Some codecs handle fetches differently, for compat reasons.
     FetchEOF,
 
     // Do a full flush of the codec.
     DataEOF
 };
 
 static_assert(!DoNotFlush, "DoNotFlush should be falsy");
 static_assert(FetchEOF, "FetchEOF should be truthy");
 static_assert(DataEOF, "DataEOF should be truthy");
 
-
-class TextCodec {
+class WTF_EXPORT TextCodec {
     WTF_MAKE_NONCOPYABLE(TextCodec); USING_FAST_MALLOC(TextCodec);
 public:
     TextCodec() { }
     virtual ~TextCodec();
 
     String decode(const char* str, size_t length, FlushBehavior flush = DoNotFlush)
     {
         bool ignored;
         return decode(str, length, flush, false, ignored);
     }
@@ skipping 11 matching lines @@
 typedef void (*EncodingNameRegistrar)(const char* alias, const char* name);
 
 typedef PassOwnPtr<TextCodec> (*NewTextCodecFunction)(const TextEncoding&, const void* additionalData);
 typedef void (*TextCodecRegistrar)(const char* name, NewTextCodecFunction, const void* additionalData);
 
 } // namespace WTF
 
 using WTF::TextCodec;
 
 #endif // TextCodec_h