Track reasons for |Node::SetNeedsStyleRecalc|

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index d963fbf0af9f21159517c29bcf63032a5871c944..09f6c2a9672e4e518fca47d4db8858860d714ab6 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -959,7 +959,7 @@ void Element::attributeChanged(const QualifiedName& name, const AtomicString& ne
         styleAttributeChanged(newValue, reason);
     } else if (isStyledElement() && isPresentationAttribute(name)) {
         elementData()->m_presentationAttributeStyleIsDirty = true;
-        setNeedsStyleRecalc(LocalStyleChange);
+        setNeedsStyleRecalc(StyleChangeReasonForTracing::fromAttribute(name), LocalStyleChange);
     }
 
     if (isIdAttributeName(name)) {
@@ -980,7 +980,7 @@ void Element::attributeChanged(const QualifiedName& name, const AtomicString& ne
 
     // If there is currently no StyleResolver, we can't be sure that this attribute change won't affect style.
     if (!styleResolver)
-        setNeedsStyleRecalc(SubtreeStyleChange);
+        setNeedsStyleRecalc(StyleChangeReasonForTracing::fromAttribute(name), SubtreeStyleChange);
 
     if (AXObjectCache* cache = document().existingAXObjectCache())
         cache->handleAttributeChanged(name, this);
@@ -1598,9 +1598,9 @@ ElementShadow& Element::ensureShadow()
     return ensureElementRareData().ensureShadow();
 }
 
-void Element::didAffectSelector(AffectedSelectorMask mask)
+void Element::didAffectSelector(const StyleChangeReasonForTracing& reason, AffectedSelectorMask mask)
 {
-    setNeedsStyleRecalc(SubtreeStyleChange);
+    setNeedsStyleRecalc(reason, SubtreeStyleChange);
     if (ElementShadow* elementShadow = shadowWhereNodeCanBeDistributed(*this))
         elementShadow->didAffectSelector(mask);
 }
@@ -1618,7 +1618,7 @@ void Element::setNeedsAnimationStyleRecalc()
     if (styleChangeType() != NoStyleChange)
         return;
 
-    setNeedsStyleRecalc(LocalStyleChange);
+    setNeedsStyleRecalc(StyleChangeReasonForTracing::create(StyleChangeReason::Animation), LocalStyleChange);
     setAnimationStyleChange(true);
 }
 
@@ -2631,7 +2631,7 @@ void Element::setFloatingPointAttribute(const QualifiedName& attributeName, doub
 void Element::setContainsFullScreenElement(bool flag)
 {
     setElementFlag(ContainsFullScreenElement, flag);
-    setNeedsStyleRecalc(SubtreeStyleChange);
+    setNeedsStyleRecalc(StyleChangeReasonForTracing::create(StyleChangeReason::FullScreen), SubtreeStyleChange);
 }
 
 static Element* parentCrossingFrameBoundaries(Element* element)
@@ -3096,14 +3096,14 @@ void Element::styleAttributeChanged(const AtomicString& newStyleString, Attribut
 
     elementData()->m_styleAttributeIsDirty = false;
 
-    setNeedsStyleRecalc(LocalStyleChange);
+    setNeedsStyleRecalc(StyleChangeReasonForTracing::create(StyleChangeReason::StyleSheetChange), LocalStyleChange);
     InspectorInstrumentation::didInvalidateStyleAttr(this);
 }
 
 void Element::inlineStyleChanged()
 {
     ASSERT(isStyledElement());
-    setNeedsStyleRecalc(LocalStyleChange);
+    setNeedsStyleRecalc(StyleChangeReasonForTracing::create(StyleChangeReason::Inline), LocalStyleChange);
     ASSERT(elementData());
     elementData()->m_styleAttributeIsDirty = true;
     InspectorInstrumentation::didInvalidateStyleAttr(this);