Improve named grid areas parsing

third_party/WebKit/Source/core/css/CSSMarkup.cpp

Index: third_party/WebKit/Source/core/css/CSSMarkup.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSMarkup.cpp b/third_party/WebKit/Source/core/css/CSSMarkup.cpp
index d038527b1b9ce1f91cd852abec18c75f4fbc6490..55987e9b4769192c450a6a8205e678c331406702 100644
--- a/third_party/WebKit/Source/core/css/CSSMarkup.cpp
+++ b/third_party/WebKit/Source/core/css/CSSMarkup.cpp
@@ -26,6 +26,7 @@
 
 #include "core/css/CSSMarkup.h"
 
+#include "core/css/parser/CSSParserIdioms.h"
 #include "wtf/HexNumber.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/StringBuilder.h"
@@ -42,13 +43,13 @@ static inline bool isCSSTokenizerIdentifier(const CharacterType* characters, uns
         ++characters;
 
     // {nmstart}
-    if (characters == end || !(characters[0] == '_' || characters[0] >= 128 || isASCIIAlpha(characters[0])))
+    if (characters == end || !isNameStartCodePoint(characters[0]))
         return false;
     ++characters;
 
     // {nmchar}*
     for (; characters != end; ++characters) {
-        if (!(characters[0] == '_' || characters[0] == '-' || characters[0] >= 128 || isASCIIAlphanumeric(characters[0])))
+        if (!isNameCodePoint(characters[0]))
             return false;
     }