Use ASCII case-insensitive matching for attribute selectors

third_party/WebKit/Source/wtf/text/WTFString.h

Index: third_party/WebKit/Source/wtf/text/WTFString.h
diff --git a/third_party/WebKit/Source/wtf/text/WTFString.h b/third_party/WebKit/Source/wtf/text/WTFString.h
index f692c9fb859f4c0f78df5f06dea75c9cd632ac03..d8cd17676b9fd4ae79bb4b8ea5eddac1b479cac4 100644
--- a/third_party/WebKit/Source/wtf/text/WTFString.h
+++ b/third_party/WebKit/Source/wtf/text/WTFString.h
@@ -87,6 +87,7 @@ enum UTF8ConversionMode {
 
 #define DISPATCH_CASE_OP(caseSensitivity, op, args)                     \
     ((caseSensitivity == TextCaseSensitive) ? op args :                 \
+     (caseSensitivity == TextCaseASCIIInsensitive) ? op##IgnoringASCIICase args : \

[tkent, 2015/12/11 00:02:45]

I was afraid the code size bloat by this.  However, |caseSensitivity| flag is
usually a constant value, and we can expect compilers eliminate unnecessary
code.  So, this is ok.

[fs, 2015/12/11 11:43:16]

Yes, this was how I reasoned about it as well.

      op##IgnoringCase args)
 
 template<bool isSpecialCharacter(UChar), typename CharacterType>
@@ -236,6 +237,10 @@ public:
     size_t findIgnoringCase(const String& str, unsigned start = 0) const
         { return m_impl ? m_impl->findIgnoringCase(str.impl(), start) : kNotFound; }
 
+    // ASCII case insensitive string matching.
+    size_t findIgnoringASCIICase(const String& str, unsigned start = 0) const
+        { return m_impl ? m_impl->findIgnoringASCIICase(str.impl(), start) : kNotFound; }
+
     // Wrappers for find adding dynamic sensitivity check.
     size_t find(const LChar* str, unsigned start, TextCaseSensitivity caseSensitivity) const
         { return DISPATCH_CASE_OP(caseSensitivity, find, (str, start)); }