[ Do not submit ] Prototype for invalidation analysis

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index f605f7a4a676c2945331d6fa1ea6ca82d5f3e9bb..64af4a434e5723f992df1caa1fbe317423f06110 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -82,6 +82,7 @@
 #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"
@@ -776,6 +777,11 @@ void Node::setNeedsStyleRecalc(StyleChangeType changeType)
         setStyleChange(changeType);
         if (changeType >= SubtreeStyleChange)
             traceStyleChangeIfNeeded(changeType);
+        TRACE_EVENT_INSTANT1(
+            TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
+            "StyleInvalidationTracking",
+            "data",
+            InspectorStyleInvalidationTrackingEvent::data(this));
     }
 
     if (existingChangeType == NoStyleChange)