[CSS] -webkit-var must be case sensitive according to specs

Source/core/css/CSSParser.cpp

Index: Source/core/css/CSSParser.cpp
diff --git a/Source/core/css/CSSParser.cpp b/Source/core/css/CSSParser.cpp
index 1a3dedcc7d8134eb11b45028a266a09274da0037..be417b95aafbdbb2bacb7dc1dba219a055bc7135 100644
--- a/Source/core/css/CSSParser.cpp
+++ b/Source/core/css/CSSParser.cpp
@@ -9341,6 +9341,16 @@ static inline bool isEqualToCSSIdentifier(CharacterType* cssString, const char*
 }
 
 template <typename CharacterType>
+static inline bool isEqualToCSSCaseSensitiveIdentifier(CharacterType* string, const char* constantString)
+{

[alancutter (OOO until 2018), 2013/05/29 13:19:44]

I would add an ASSERT(*constantString) here lest this go flying off the deep end
should string = constantString = "".

+    do {
+        if (*string++ != *constantString++)
+            return false;
+    } while (*constantString);
+    return true;
+}
+
+template <typename CharacterType>
 static CharacterType* checkAndSkipEscape(CharacterType* currentCharacter)
 {
     // Returns with 0, if escape check is failed. Otherwise
@@ -10258,7 +10268,7 @@ inline bool CSSParser::detectCSSVariablesToken(int length)
     if (length < sizeof("-webkit-var-*") - 1)
         return false;
     CharacterType* name = tokenStart<CharacterType>();
-    return name[11] == '-' && isIdentifierStartAfterDash(name + 12) && isEqualToCSSIdentifier(name + 1, "webkit-var");
+    return name[11] == '-' && isIdentifierStartAfterDash(name + 12) && isEqualToCSSCaseSensitiveIdentifier(name + 1, "webkit-var");
 }