Reviewed by Darin Adler.

        Implement shadow DOM-aware event targeting and introduce EventContext to track the context of each event dispatch.
        https://bugs.webkit.org/show_bug.cgi?id=46015

        Tuned shadow-boundary-crossing.html to better reflect its point: the event should indeed fire (it used to be swallowed),
        but its target should be a non-shadow node.

        Tweaked audio-delete-while-slider-thumb-clicked.html to actually click on
        the scrubber thumb (it was off by 2 pixels).

        * fast/events/shadow-boundary-crossing.html: Modified the test.
        * media/audio-delete-while-slider-thumb-clicked.html : Ditto.
2010-11-03  Dimitri Glazkov  <dglazkov@chromium.org>

        Reviewed by Darin Adler.

        Implement shadow DOM-aware event targeting and introduce EventContext to track the context of each event dispatch.
        https://bugs.webkit.org/show_bug.cgi?id=46015

        This patch adds the notion of EventContext (and a very similar-acting WindowEventContext, specifically
        for DOMWindow), an abstraction that carries information around dispatching an event for any given Node.

        This abstraction is necessary to ensure that events, fired from shadow DOM nodes are properly retargeted to
        appear as if they are coming from their host, thus never exposing the shadow DOM nodes to the world outside.

        * Android.mk: Added EventContext, WindowEventContext files.
        * CMakeLists.txt: Ditto.
        * GNUmakefile.am: Ditto.
        * WebCore.gypi: Ditto.
        * WebCore.pro: Ditto.
        * WebCore.xcodeproj/project.pbxproj: Ditto.
        * WebCore.vcproj/WebCore.vcproj: Ditto.
        * dom/ContainerNode.cpp:
        (WebCore::notifyChildInserted): Changed to be shadow DOM-aware.
        * dom/EventContext.cpp: Added.
        * dom/EventContext.h: Added.
        * dom/Node.cpp:
        (WebCore::Node::markAncestorsWithChildNeedsStyleRecalc): Changed to be shadow DOM-aware.
        (WebCore::Node::createRendererIfNeeded): Ditto.
        (WebCore::Node::parentOrHostNode): Added new helper method.
        (WebCore::Node::enclosingLinkEventParentOrSelf): Changed to be shadow DOM-aware.
        (WebCore::eventTargetRespectingSVGTargetRules): Collapsed two helper methods into one.
        (WebCore::Node::eventAncestors): Refactored to collect a vector of EventContexts.
        (WebCore::Node::topEventContext): Added.
        (WebCore::eventHasListeners): Changed to use EventContexts.
        (WebCore::Node::dispatchGenericEvent): Ditto.
        * dom/Node.h: Removed eventParentNode that's no longer needed, added parentOrHostNode decl,
            and changed signature of eventAncestors to use EventContexts.
        * dom/Text.cpp:
        (WebCore::Text::createRenderer): Changed to be shadow DOM-aware.
        * inspector/InspectorDOMAgent.cpp:
        (WebCore::InspectorDOMAgent::getEventListenersForNode): Changed to use EventContexts.
        * page/EventHandler.cpp:
        (WebCore::EventHandler::updateMouseEventTargetNode): Removed code that's no longer necessary.
        * rendering/ShadowElement.h: Made m_shadowParent a RefPtr to avoid stale references when parent
        is deleted.
        * svg/SVGElement.cpp: Removed eventParentNode that's no longer needed.
        * svg/SVGElement.h: Ditto.
        * dom/WindowEventContext.cpp: Added.
        * dom/WindowEventContext.h: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71244 268f45cc-cd09-0410-ab3c-d52691b4dbfc