Reviewed by Eric Seidel.

        WebInspector: Adds a timeline agent to InspectorController that collects
        high-level timing data about event dispatch, layout, painting and HTML
        parsing and makes it available to Inspector.
        https://bugs.webkit.org/show_bug.cgi?id=25503

        * WebCore.gypi:
        * WebCore.xcodeproj/project.pbxproj:
        * dom/Document.cpp:
        (WebCore::Document::recalcStyle):
        * dom/Document.h:
        (WebCore::Document::inspectorTimelineAgent):
        * dom/Node.cpp:
        (WebCore::Node::dispatchGenericEvent):
        * html/HTMLTokenizer.cpp:
        (WebCore::HTMLTokenizer::write):
        * inspector/DOMDispatchTimelineItem.cpp: Added.
        (WebCore::DOMDispatchTimelineItem::DOMDispatchTimelineItem):
        (WebCore::DOMDispatchTimelineItem::convertToScriptObject):
        * inspector/DOMDispatchTimelineItem.h: Added.
        (WebCore::DOMDispatchTimelineItem::~DOMDispatchTimelineItem):
        * inspector/InspectorBackend.cpp:
        (WebCore::InspectorBackend::enableTimeline):
        (WebCore::InspectorBackend::disableTimeline):
        (WebCore::InspectorBackend::timelineEnabled):
        * inspector/InspectorBackend.h:
        * inspector/InspectorBackend.idl:
        * inspector/InspectorController.cpp:
        (WebCore::InspectorController::setFrontendProxyObject):
        (WebCore::InspectorController::close):
        (WebCore::InspectorController::resetScriptObjects):
        (WebCore::InspectorController::enableTimeline):
        (WebCore::InspectorController::disableTimeline):
        (WebCore::InspectorController::timelineEnabled):
        * inspector/InspectorController.h:
        (WebCore::InspectorController::timelineAgent):
        * inspector/InspectorFrontend.cpp:
        (WebCore::InspectorFrontend::timelineWasEnabled):
        (WebCore::InspectorFrontend::timelineWasDisabled):
        (WebCore::InspectorFrontend::addItemToTimeline):
        * inspector/InspectorFrontend.h:
        * inspector/InspectorTimelineAgent.cpp: Added.
        (WebCore::InspectorTimelineAgent::InspectorTimelineAgent):
        (WebCore::InspectorTimelineAgent::~InspectorTimelineAgent):
        (WebCore::InspectorTimelineAgent::willDispatchDOMEvent):
        (WebCore::InspectorTimelineAgent::didDispatchDOMEvent):
        (WebCore::InspectorTimelineAgent::willLayout):
        (WebCore::InspectorTimelineAgent::didLayout):
        (WebCore::InspectorTimelineAgent::willRecalculateStyle):
        (WebCore::InspectorTimelineAgent::didRecalculateStyle):
        (WebCore::InspectorTimelineAgent::willPaint):
        (WebCore::InspectorTimelineAgent::didPaint):
        (WebCore::InspectorTimelineAgent::willWriteHTML):
        (WebCore::InspectorTimelineAgent::didWriteHTML):
        (WebCore::InspectorTimelineAgent::reset):
        (WebCore::InspectorTimelineAgent::didCompleteCurrentRecord):
        (WebCore::InspectorTimelineAgent::currentTimeInMilliseconds):
        (WebCore::InspectorTimelineAgent::sessionTimeInMilliseconds):
        * inspector/InspectorTimelineAgent.h: Added.
        * inspector/TimelineItem.cpp: Added.
        (WebCore::TimelineItem::TimelineItem):
        (WebCore::TimelineItem::addToTimeline):
        (WebCore::TimelineItem::convertToScriptObject):
        (WebCore::TimelineItem::convertChildrenToScriptArray):
        (WebCore::TimelineItem::addChildItem):
        * inspector/TimelineItem.h: Added.
        (WebCore::):
        (WebCore::TimelineItem::~TimelineItem):
        (WebCore::TimelineItem::previous):
        (WebCore::TimelineItem::releasePrevious):
        (WebCore::TimelineItem::setEndTime):
        (WebCore::TimelineItem::type):
        * inspector/front-end/TimelineAgent.js: Added.
        (WebInspector.TimelineAgent):
        (WebInspector.addItemToTimeline):
        (WebInspector.timelineWasEnabled):
        (WebInspector.timelineWasDisabled):
        * inspector/front-end/inspector.html:
        * page/FrameView.cpp:
        (WebCore::FrameView::layout):
        (WebCore::FrameView::paintContents):
        * page/FrameView.h:
        (WebCore::FrameView::inspectorTimelineAgent):
        * page/Page.cpp:
        (WebCore::Page::inspectorTimelineAgent):
        * page/Page.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@48167 268f45cc-cd09-0410-ab3c-d52691b4dbfc