Add WebNode::isCommentNode().

Source/web/WebNode.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 173 matching lines @@
 bool WebNode::isLink() const
 {
     return m_private->isLink();
 }
 
 bool WebNode::isTextNode() const
 {
     return m_private->isTextNode();
 }
 
+bool WebNode::isCommentNode() const
+{
+    return m_private->nodeType() == Node::COMMENT_NODE;
+}
+
 bool WebNode::isFocusable() const
 {
     if (!m_private->isElementNode())
         return false;
     m_private->document().updateLayoutIgnorePendingStylesheets();
     return toElement(m_private.get())->isFocusable();
 }
 
 bool WebNode::isContentEditable() const
 {
@@ skipping 109 matching lines @@
     m_private = node;
     return *this;
 }
 
 WebNode::operator PassRefPtrWillBeRawPtr<Node>() const
 {
     return m_private.get();
 }
 
 } // namespace blink