Add TRACE_EVENT for common events in EventHandler

Often in traces it's hard to know what events are being hanled and how
much time is spent where in the EventDispatcher and EventHandler. This
patch adds a bunch of new TRACE_EVENT's to make it easier.

Review URL: https://codereview.chromium.org/210823007

git-svn-id: svn://svn.chromium.org/blink/trunk@170011 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/events/EventDispatcher.cpp

@@ -41,6 +41,7 @@ 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;
@@ -99,6 +100,8 @@ void EventDispatcher::dispatchSimulatedClick(Node* node, Event* underlyingEvent,
 
 bool EventDispatcher::dispatch()
 {
+    TRACE_EVENT0("webkit", "EventDispatcher::dispatch");
+
 #ifndef NDEBUG
     ASSERT(!m_eventDispatched);
     m_eventDispatched = true;

third_party/WebKit/Source/core/page/EventHandler.cpp

@@ -502,6 +502,8 @@ void EventHandler::selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHit
 
 bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestResults& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMousePressEventDoubleClick");
+
     if (event.event().button() != LeftButton)
         return false;
 
@@ -520,6 +522,8 @@ bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestR
 
 bool EventHandler::handleMousePressEventTripleClick(const MouseEventWithHitTestResults& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMousePressEventTripleClick");
+
     if (event.event().button() != LeftButton)
         return false;
 
@@ -545,6 +549,8 @@ static int textDistance(const Position& start, const Position& end)
 
 bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMousePressEventSingleClick");
+
     m_frame->document()->updateLayoutIgnorePendingStylesheets();
     Node* innerNode = event.targetNode();
     if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
@@ -621,6 +627,8 @@ static inline bool canMouseDownStartSelect(Node* node)
 
 bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMousePressEvent");
+
     // Reset drag state.
     dragState().m_dragSrc = nullptr;
 
@@ -686,6 +694,8 @@ bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& eve
 
 bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMouseDraggedEvent");
+
     if (!m_mousePressed)
         return false;
 
@@ -885,6 +895,8 @@ bool EventHandler::panScrollInProgress() const
 
 HitTestResult EventHandler::hitTestResultAtPoint(const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType, const LayoutSize& padding)
 {
+    TRACE_EVENT0("webkit", "EventHandler::hitTestResultAtPoint");
+
     // We always send hitTestResultAtPoint to the main frame if we have one,
     // otherwise we might hit areas that are obscured by higher frames.
     if (Page* page = m_frame->page()) {
@@ -1285,6 +1297,8 @@ static LayoutPoint documentPointForWindowPoint(LocalFrame* frame, const IntPoint
 
 bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMousePressEvent");
+
     RefPtr<FrameView> protector(m_frame->view());
 
     bool defaultPrevented = dispatchSyntheticTouchEventIfEnabled(mouseEvent);
@@ -1446,6 +1460,8 @@ ScrollableArea* EventHandler::associatedScrollableArea(const RenderLayer* layer)
 
 bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMouseMoveEvent");
+
     RefPtr<FrameView> protector(m_frame->view());
     MaximumDurationTracker maxDurationTracker(&m_maxMouseMovedDuration);
 
@@ -1473,6 +1489,8 @@ bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& event)
 
 void EventHandler::handleMouseLeaveEvent(const PlatformMouseEvent& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMouseLeaveEvent");
+
     RefPtr<FrameView> protector(m_frame->view());
     handleMouseMoveOrLeaveEvent(event);
 }
@@ -1611,6 +1629,8 @@ static Node* parentForClickEvent(const Node& node)
 
 bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleMouseReleaseEvent");
+
     RefPtr<FrameView> protector(m_frame->view());
 
     m_frame->selection().setCaretBlinkingSuspended(false);
@@ -3577,6 +3597,8 @@ HitTestResult EventHandler::hitTestResultInFrame(LocalFrame* frame, const Layout
 
 bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
 {
+    TRACE_EVENT0("webkit", "EventHandler::handleTouchEvent");
+
     // First build up the lists to use for the 'touches', 'targetTouches' and 'changedTouches' attributes
     // in the JS event. See http://www.sitepen.com/blog/2008/07/10/touching-and-gesturing-on-the-iphone/
     // for an overview of how these lists fit together.