Use the correct case converter for |localName| and |tagName|

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 150 matching lines @@
   }
   bool endsWith(UChar character) const { return m_string.endsWith(character); }
 
   // Returns a lowercase/uppercase version of the string. These functions might
   // convert non-ASCII characters to ASCII characters. For example, lower() for
   // U+212A is 'k', upper() for U+017F is 'S'.
   // These functions are rarely used to implement web platform features.
   AtomicString lower() const;
   AtomicString upper() const { return AtomicString(impl()->upper()); }
 
-  // Returns a lowercase version of the string. This function converts only
-  // upper-case ASCII characters.
+  // Returns a lowercase/uppercase version of the string. This function converts
+  // only upper/lower-case ASCII characters.
   AtomicString lowerASCII() const;
+  AtomicString upperASCII() const { return AtomicString(impl()->upperASCII()); }

[Sunny, 2017/03/01 08:59:25]

Hi tkent, I'm not sure call impl() here will return nullptr or not but I saw
line 169 use it directly, can I use it directly?

[tkent, 2017/03/01 12:21:27]

It should support null impl(). So implement it like AtomicString::lowerASCII().

 
   int toInt(bool* ok = 0) const { return m_string.toInt(ok); }
   double toDouble(bool* ok = 0) const { return m_string.toDouble(ok); }
   float toFloat(bool* ok = 0) const { return m_string.toFloat(ok); }
 
   static AtomicString number(int);
   static AtomicString number(unsigned);
   static AtomicString number(long);
   static AtomicString number(unsigned long);
   static AtomicString number(long long);
@@ skipping 119 matching lines @@
 using WTF::AtomicString;
 using WTF::nullAtom;
 using WTF::emptyAtom;
 using WTF::starAtom;
 using WTF::xmlAtom;
 using WTF::xmlnsAtom;
 using WTF::xlinkAtom;
 
 #include "wtf/text/StringConcatenate.h"
 #endif  // AtomicString_h