[ Do not submit ] Prototype for invalidation analysis

Source/core/dom/Node.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/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 61 matching lines @@
 #include "core/events/TextEvent.h"
 #include "core/events/TouchEvent.h"
 #include "core/events/UIEvent.h"
 #include "core/events/WheelEvent.h"
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLDialogElement.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLStyleElement.h"
+#include "core/inspector/InspectorTraceEvents.h"
 #include "core/page/ContextMenuController.h"
 #include "core/page/EventHandler.h"
 #include "core/page/Page.h"
 #include "core/frame/Settings.h"
 #include "core/rendering/FlowThreadController.h"
 #include "core/rendering/RenderBox.h"
 #include "core/svg/graphics/SVGImage.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/Partitions.h"
 #include "platform/TraceEvent.h"
@@ skipping 676 matching lines @@
 {
     ASSERT(changeType != NoStyleChange);
     if (!inActiveDocument())
         return;
 
     StyleChangeType existingChangeType = styleChangeType();
     if (changeType > existingChangeType) {
         setStyleChange(changeType);
         if (changeType >= SubtreeStyleChange)
             traceStyleChangeIfNeeded(changeType);
+        TRACE_EVENT_INSTANT1(
+            TRACE_DISABLED_BY_DEFAULT("devtools.timeline.styleInvalidationTracking"),

[caseq, 2014/08/26 12:19:07]

nit: I wonder if category needs to be that specific (i.e. can we just have
devtools.timeline.invalidations, or will we have the analysis of different types
of invalidations independently)?

+            "StyleInvalidationTracking",
+            "data",
+            InspectorStyleInvalidationTrackingEvent::data(this));
     }
 
     if (existingChangeType == NoStyleChange)
         markAncestorsWithChildNeedsStyleRecalc();
 
     if (isElementNode() && hasRareData())
         toElement(*this).setAnimationStyleChange(false);
 }
 
 void Node::clearNeedsStyleRecalc()
@@ skipping 1694 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif