Support type selector for camel-cased SVG elements in HTML.

Source/core/css/SelectorFilter.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 12 matching lines @@
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/css/SelectorFilter.h"
 
 #include "core/css/CSSSelector.h"
+#include "core/dom/Document.h"
 
 namespace blink {
 
 // Salt to separate otherwise identical string hashes so a class-selector like .article won't match <article> elements.
 enum { TagNameSalt = 13, IdAttributeSalt = 17, ClassAttributeSalt = 19 };
 
 static inline void collectElementIdentifierHashes(const Element& element, Vector<unsigned, 4>& identifierHashes)
 {
-    identifierHashes.append(element.localName().impl()->existingHash() * TagNameSalt);
+    AtomicString localName = element.localName();
+    if (!element.isHTMLElement() && element.document().isHTMLDocument())
+        localName = localName.lower();
+    identifierHashes.append(localName.impl()->existingHash() * TagNameSalt);
     if (element.hasID())
         identifierHashes.append(element.idForStyleResolution().impl()->existingHash() * IdAttributeSalt);
     if (element.isStyledElement() && element.hasClass()) {
         const SpaceSplitString& classNames = element.classNames();
         size_t count = classNames.size();
         for (size_t i = 0; i < count; ++i)
             identifierHashes.append(classNames[i].impl()->existingHash() * ClassAttributeSalt);
     }
 }
 
@@ skipping 124 matching lines @@
 }
 
 DEFINE_TRACE(SelectorFilter)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_parentStack);
 #endif
 }
 
 }