Reviewed by Dan Bernstein.

        Add scaffolding for the implementation of Access Control for Cross-site Requests. 

        * GNUmakefile.am:
        * WebCore.pro:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * WebCoreSources.bkl:
        * xml/AccessControlList.cpp: Added.
        (WebCore::AccessControlList::AccessControlList):
        (WebCore::AccessControlList::~AccessControlList):
        (WebCore::AccessControlList::parseAccessControlHeader):
        (WebCore::AccessControlList::checkOrigin):
        * xml/AccessControlList.h: Added.
        * xml/AccessItem.cpp: Added.
        (WebCore::AccessItem::AccessItem):
        (WebCore::AccessItem::parseAccessItem):
        (WebCore::AccessItem::matches):
        * xml/AccessItem.h: Added.
        * xml/AccessItemRule.cpp: Added.
        (WebCore::AccessItemRule::AccessItemRule):
        (WebCore::AccessItemRule::parseAccessItemRule):
        * xml/AccessItemRule.h: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33033 268f45cc-cd09-0410-ab3c-d52691b4dbfc