[Invalidation Tracking] Trace StyleInvalidator setNeedsStyleRecalc

Source/core/css/invalidation/StyleInvalidator.cpp

Index: Source/core/css/invalidation/StyleInvalidator.cpp
diff --git a/Source/core/css/invalidation/StyleInvalidator.cpp b/Source/core/css/invalidation/StyleInvalidator.cpp
index cefc3d7b17650398f523f56d1e6adc0d4ec46b8d..9343d14e46f38c76573db3c000f068fb1b8b2ede 100644
--- a/Source/core/css/invalidation/StyleInvalidator.cpp
+++ b/Source/core/css/invalidation/StyleInvalidator.cpp
@@ -13,6 +13,7 @@
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
+#include "core/inspector/InspectorTraceEvents.h"
 #include "core/rendering/RenderObject.h"
 
 namespace blink {
@@ -86,8 +87,10 @@ bool StyleInvalidator::RecursionData::matchesCurrentInvalidationSets(Element& el
 {
     ASSERT(!m_wholeSubtreeInvalid);
 
-    if (m_invalidateCustomPseudo && element.shadowPseudoId() != nullAtom)
+    if (m_invalidateCustomPseudo && element.shadowPseudoId() != nullAtom) {
+        TRACE_STYLE_INVALIDATOR_INVALIDATION(element, InvalidateCustomPseudo);
         return true;
+    }
 
     for (InvalidationSets::iterator it = m_invalidationSets.begin(); it != m_invalidationSets.end(); ++it) {
         if ((*it)->invalidatesElement(element))
@@ -108,9 +111,13 @@ bool StyleInvalidator::checkInvalidationSetsAgainstElement(Element& element, Sty
             for (InvalidationList::const_iterator it = invalidationList->begin(); it != invalidationList->end(); ++it)
                 recursionData.pushInvalidationSet(**it);
             // FIXME: It's really only necessary to clone the render style for this element, not full style recalc.
+            TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
+                "StyleInvalidatorInvalidationTracking",
+                "data", InspectorStyleInvalidatorInvalidateEvent::invalidationList(element, *invalidationList));
             return true;
         }
     }
+
     return recursionData.matchesCurrentInvalidationSets(element);
 }
 
@@ -148,10 +155,12 @@ bool StyleInvalidator::invalidate(Element& element, StyleInvalidator::RecursionD
         element.setNeedsStyleRecalc(recursionData.wholeSubtreeInvalid() ? SubtreeStyleChange : LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
     } else if (recursionData.hasInvalidationSets() && someChildrenNeedStyleRecalc) {
         // Clone the RenderStyle in order to preserve correct style sharing, if possible. Otherwise recalc style.
-        if (RenderObject* renderer = element.renderer())
+        if (RenderObject* renderer = element.renderer()) {
             renderer->setStyleInternal(RenderStyle::clone(renderer->style()));
-        else
+        } else {
+            TRACE_STYLE_INVALIDATOR_INVALIDATION(element, PreventStyleSharingForParent);
             element.setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
+        }
     }
 
     element.clearChildNeedsStyleInvalidation();