Begin tracking why layout is invalidated

Source/core/layout/LayoutObject.cpp

Index: Source/core/layout/LayoutObject.cpp
diff --git a/Source/core/layout/LayoutObject.cpp b/Source/core/layout/LayoutObject.cpp
index f5e859a4720a8f87dce35e4a1bd908f6355e92dc..1d44a1cc3b4daf7f15516980a32e7c1b42863d0e 100644
--- a/Source/core/layout/LayoutObject.cpp
+++ b/Source/core/layout/LayoutObject.cpp
@@ -1711,7 +1711,7 @@ void LayoutObject::setStyle(PassRefPtr<LayoutStyle> style)
 
     if (!diff.needsFullLayout()) {
         if (updatedDiff.needsFullLayout())
-            setNeedsLayoutAndPrefWidthsRecalc();
+            setNeedsLayoutAndPrefWidthsRecalc(LayoutInvalidationReason::StyleChange);
         else if (updatedDiff.needsPositionedMovementLayout())
             setNeedsPositionedMovementLayout();
     }
@@ -1859,7 +1859,7 @@ void LayoutObject::styleDidChange(StyleDifference diff, const LayoutStyle* oldSt
             markContainingBlocksForOverflowRecalc();
 
         if (diff.needsFullLayout())
-            setNeedsLayoutAndPrefWidthsRecalc();
+            setNeedsLayoutAndPrefWidthsRecalc(LayoutInvalidationReason::StyleChange);
     } else if (diff.needsPositionedMovementLayout()) {
         setNeedsPositionedMovementLayout();
     }