Add support for case-insensitive attribute value selectors

Source/core/css/CSSSelector.h

Index: Source/core/css/CSSSelector.h
diff --git a/Source/core/css/CSSSelector.h b/Source/core/css/CSSSelector.h
index da24b51feaf8dc22c402752991b4d71254c48439..d36acdea2ed40967a57bf9475b7b6bffdec86dcf 100644
--- a/Source/core/css/CSSSelector.h
+++ b/Source/core/css/CSSSelector.h
@@ -238,6 +238,11 @@ namespace WebCore {
             RightBottomMarginBox,
         };
 
+        enum AttributeFlags {
+            NoAttributeFlags,
+            CaseInsensitive,
+        };
+
         PseudoType pseudoType() const
         {
             if (m_pseudoType == PseudoNotParsed)
@@ -261,6 +266,7 @@ namespace WebCore {
         // how you use the returned QualifiedName.
         // http://www.w3.org/TR/css3-selectors/#attrnmsp
         const QualifiedName& attribute() const;
+        AttributeFlags attributeFlags() const;
         // Returns the argument of a parameterized selector. For example, nth-child(2) would have an argument of 2.
         const AtomicString& argument() const { return m_hasRareData ? m_data.m_rareData->m_argument : nullAtom; }
         const CSSSelectorList* selectorList() const { return m_hasRareData ? m_data.m_rareData->m_selectorList.get() : 0; }
@@ -271,7 +277,7 @@ namespace WebCore {
 #endif
 
         void setValue(const AtomicString&);
-        void setAttribute(const QualifiedName&);
+        void setAttribute(const QualifiedName&, unsigned flags);
         void setArgument(const AtomicString&);
         void setSelectorList(PassOwnPtr<CSSSelectorList>);
         void setMatchUserAgentOnly();
@@ -346,8 +352,14 @@ namespace WebCore {
             bool matchNth(int count);
 
             AtomicString m_value;
-            int m_a; // Used for :nth-*
-            int m_b; // Used for :nth-*
+            union Bits {
+                Bits() : m_nth() { }
+                struct {
+                    int m_a; // Used for :nth-*
+                    int m_b; // Used for :nth-*
+                } m_nth;
+                unsigned m_attributeFlags; // used for attribute selector (with value)
+            } m_bits;
             QualifiedName m_attribute; // used for attribute selector
             AtomicString m_argument; // Used for :contains, :lang, :nth-*
             OwnPtr<CSSSelectorList> m_selectorList; // Used for :-webkit-any and :not
@@ -372,6 +384,13 @@ inline const QualifiedName& CSSSelector::attribute() const
     return m_data.m_rareData->m_attribute;
 }
 
+inline CSSSelector::AttributeFlags CSSSelector::attributeFlags() const
+{
+    ASSERT(isAttributeSelector());
+    ASSERT(m_hasRareData);
+    return static_cast<AttributeFlags>(m_data.m_rareData->m_bits.m_attributeFlags);
+}
+
 inline bool CSSSelector::matchesPseudoElement() const
 {
     if (m_pseudoType == PseudoUnknown)