Reviewed by Pavel Feldman.

        Followon to bug 31080, which protects Timeline
        instrumentation in the case where InspectorTimelineAgent
        is enabled or disabled during an event dispatch.

        https://bugs.webkit.org/show_bug.cgi?id=31121

        * bindings/v8/V8Proxy.cpp:
        (WebCore::V8Proxy::evaluate):
        * dom/Document.cpp:
        (WebCore::Document::recalcStyle):
        * dom/Node.cpp:
        (WebCore::Node::dispatchGenericEvent):
        * html/HTMLTokenizer.cpp:
        (WebCore::HTMLTokenizer::write):
        * page/DOMWindow.cpp:
        (WebCore::DOMWindow::inspectorTimelineAgent):
        (WebCore::DOMWindow::dispatchEvent):
        * page/DOMWindow.h:
        * page/FrameView.cpp:
        (WebCore::FrameView::layout):
        (WebCore::FrameView::paintContents):
        * xml/XMLHttpRequest.cpp:
        (WebCore::XMLHttpRequest::callReadyStateChangeListener):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@50523 268f45cc-cd09-0410-ab3c-d52691b4dbfc