Add support for case-insensitive attribute value selectors

Source/core/css/CSSGrammar.y

Index: Source/core/css/CSSGrammar.y
diff --git a/Source/core/css/CSSGrammar.y b/Source/core/css/CSSGrammar.y
index 97d1672e06a11feead3e4e79a15d887a78189d15..8870a84ba5d61f28cdfdf93bc1ab1ea8b4465946 100644
--- a/Source/core/css/CSSGrammar.y
+++ b/Source/core/css/CSSGrammar.y
@@ -346,6 +346,8 @@ inline static CSSParserValue makeIdentValue(CSSParserString string)
 %type <integer> match
 %type <integer> unary_operator
 %type <integer> maybe_unary_operator
+%type <integer> attr_flags
+%type <integer> maybe_attr_flags
 %type <character> operator
 
 %type <valueList> expr
@@ -1240,26 +1242,40 @@ attr_name:
     }
     ;
 
+attr_flags:
+    IDENT maybe_space {
+        unsigned flags;
+        if (!parser->parseAttributeFlags(flags, $1))
+            YYERROR;
+        $$ = flags;
+    }
+    ;
+
+maybe_attr_flags:
+    attr_flags
+    | /* empty */ { $$ = CSSSelector::NoAttributeFlags; }
+    ;
+
 attrib:
     '[' maybe_space attr_name closing_square_bracket {
         $$ = parser->createFloatingSelector();
-        $$->setAttribute(QualifiedName(nullAtom, $3, nullAtom));
+        $$->setAttribute(QualifiedName(nullAtom, $3, nullAtom), CSSSelector::NoAttributeFlags);
         $$->setMatch(CSSSelector::Set);
     }
-    | '[' maybe_space attr_name match maybe_space ident_or_string maybe_space closing_square_bracket {
+    | '[' maybe_space attr_name match maybe_space ident_or_string maybe_space maybe_attr_flags closing_square_bracket {
         $$ = parser->createFloatingSelector();
-        $$->setAttribute(QualifiedName(nullAtom, $3, nullAtom));
+        $$->setAttribute(QualifiedName(nullAtom, $3, nullAtom), $8);
         $$->setMatch((CSSSelector::Match)$4);
         $$->setValue($6);
     }
     | '[' maybe_space namespace_selector attr_name closing_square_bracket {
         $$ = parser->createFloatingSelector();
-        $$->setAttribute(parser->determineNameInNamespace($3, $4));
+        $$->setAttribute(parser->determineNameInNamespace($3, $4), CSSSelector::NoAttributeFlags);
         $$->setMatch(CSSSelector::Set);
     }
-    | '[' maybe_space namespace_selector attr_name match maybe_space ident_or_string maybe_space closing_square_bracket {
+    | '[' maybe_space namespace_selector attr_name match maybe_space ident_or_string maybe_space maybe_attr_flags closing_square_bracket {
         $$ = parser->createFloatingSelector();
-        $$->setAttribute(parser->determineNameInNamespace($3, $4));
+        $$->setAttribute(parser->determineNameInNamespace($3, $4), $9);
         $$->setMatch((CSSSelector::Match)$5);
         $$->setValue($7);
     }