Add support for CSS unicod encoding to the text codec.

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

Index: third_party/WebKit/Source/wtf/text/TextCodec.h
diff --git a/third_party/WebKit/Source/wtf/text/TextCodec.h b/third_party/WebKit/Source/wtf/text/TextCodec.h
index 27e312858bd7bfe9743e3c32e96927c96b1946b3..aab4758f3e187e5ca29064e2fa9487d6554d6ce5 100644
--- a/third_party/WebKit/Source/wtf/text/TextCodec.h
+++ b/third_party/WebKit/Source/wtf/text/TextCodec.h
@@ -50,7 +50,11 @@ enum UnencodableHandling {
     // 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

[Łukasz Anforowicz, 2016/04/27 04:28:12]

nit: I read that C++11 allows a trailing comma in enum definitions.  Maybe we
could add that here to minimize future changes (and streamline git blame) if we
ever need to add more enum values.

[bburns, 2016/04/27 20:24:21]

Done.

 };
 
 typedef char UnencodableReplacementArray[32];