Add support for CSS unicod encoding to the text codec.

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

Index: third_party/WebKit/Source/wtf/text/TextCodec.cpp
diff --git a/third_party/WebKit/Source/wtf/text/TextCodec.cpp b/third_party/WebKit/Source/wtf/text/TextCodec.cpp
index 191ebb5689055add7eb204a4518e9cc21fad1ce9..b613f3583ecee3110f0155eb00cf5a7f43c0ace8 100644
--- a/third_party/WebKit/Source/wtf/text/TextCodec.cpp
+++ b/third_party/WebKit/Source/wtf/text/TextCodec.cpp
@@ -47,6 +47,10 @@ int TextCodec::getUnencodableReplacement(unsigned codePoint, UnencodableHandling
     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;