Reviewed by Timothy Hatcher.

        Changes TimelineItems to be created with raw timestamps as opposed
        to a time relative to a start of session.  Normalized timestamps cause
        problems when monitoring a browsing session across multiple page
        transitions.

        * inspector/InspectorTimelineAgent.cpp:
        (WebCore::InspectorTimelineAgent::InspectorTimelineAgent):
        (WebCore::InspectorTimelineAgent::willDispatchDOMEvent):
        (WebCore::InspectorTimelineAgent::willLayout):
        (WebCore::InspectorTimelineAgent::willRecalculateStyle):
        (WebCore::InspectorTimelineAgent::willPaint):
        (WebCore::InspectorTimelineAgent::willWriteHTML):
        (WebCore::InspectorTimelineAgent::reset):
        (WebCore::InspectorTimelineAgent::didCompleteCurrentRecord):
        * inspector/InspectorTimelineAgent.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@49898 268f45cc-cd09-0410-ab3c-d52691b4dbfc