Reviewed by Maciej.

    Reviewed by Maciej.

        http://bugs.webkit.org/show_bug.cgi?id=16511
        Speed up ClassNodeList and NamedNodeList by using the caching mechanism employed by ChildNodeList.
        - This give a ~2.15x speedup on the native test @ http://ejohn.org/apps/classname/

        * dom/ChildNodeList.cpp: Use the caching NodeList constructor to turn on caching.
        (WebCore::ChildNodeList::ChildNodeList):
        * dom/ClassNodeList.cpp:
        (WebCore::ClassNodeList::ClassNodeList):
        * dom/ClassNodeList.h:

        Move getElementsByName and getElementsByClassName to Node so they
        can use easily employ the caching already used by ChildNodeLists.  In the case of
        getElementsByClassName, this reduces code duplication in Element as well
        * dom/Document.cpp:
        * dom/Document.h:

        Move getElementsByClassName to Node.
        * dom/Element.cpp:
        * dom/Element.h:

        * dom/NameNodeList.cpp: Use the caching NodeList constructor to turn on caching.
        (WebCore::NameNodeList::NameNodeList):
        (WebCore::NameNodeList::item):
        * dom/NameNodeList.h:

        Add maps of caches for ClassNodeLists and NameNodeList to NodeListsNodeData.
        * dom/Node.cpp:
        (WebCore::TagNodeList::TagNodeList):
        (WebCore::Node::Node):
        (WebCore::Node::~Node):
        (WebCore::Node::childNodes):
        (WebCore::Node::registerNodeList):
        (WebCore::Node::getElementsByName):
        (WebCore::Node::getElementsByClassName):
        * dom/Node.h: Make m_nodeLists an OwnPtr.  Moved getElementsByName and getElementsByClassName here

        Allow subclasses to choose whether they want to receive the notifications using a new bit.
        * dom/NodeList.cpp:
        (WebCore::NodeList::NodeList):
        * dom/NodeList.h:
        (WebCore::NodeList::needsNotifications):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@28868 268f45cc-cd09-0410-ab3c-d52691b4dbfc