Add TRACE_EVENT for common events in EventHandler

Source/core/events/EventDispatcher.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 23 matching lines @@
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/frame/FrameView.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 static HashSet<Node*>* gNodesDispatchingSimulatedClicks = 0;
 
 bool EventDispatcher::dispatchEvent(Node* node, PassRefPtr<EventDispatchMediator> mediator)
 {
+    TRACE_EVENT0("webkit", "EventDispatcher::dispatchEvent");
     ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
     if (!mediator->event())
         return true;
     EventDispatcher dispatcher(node, mediator->event());
     return mediator->dispatchEvent(&dispatcher);
 }
 
 EventDispatcher::EventDispatcher(Node* node, PassRefPtr<Event> event)
     : m_node(node)
     , m_event(event)
@@ skipping 38 matching lines @@
     node->setActive(false);
 
     // always send click
     EventDispatcher(node, SimulatedMouseEvent::create(EventTypeNames::click, node->document().domWindow(), underlyingEvent)).dispatch();
 
     gNodesDispatchingSimulatedClicks->remove(node);
 }
 
 bool EventDispatcher::dispatch()
 {
+    TRACE_EVENT0("webkit", "EventDispatcher::dispatch");
+
 #ifndef NDEBUG
     ASSERT(!m_eventDispatched);
     m_eventDispatched = true;
 #endif
     ChildNodesLazySnapshot::takeChildNodesLazySnapshot();
 
     m_event->setTarget(EventPath::eventTargetRespectingTargetRules(m_node.get()));
     ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
     ASSERT(m_event->target());
     WindowEventContext windowEventContext(m_event.get(), m_node.get(), topNodeEventContext());
@@ skipping 104 matching lines @@
         }
     }
 }
 
 const NodeEventContext* EventDispatcher::topNodeEventContext()
 {
     return m_event->eventPath().isEmpty() ? 0 : &m_event->eventPath().last();
 }
 
 }