Add GraphicsLayerDebugInfo::includesNewPaintInvalidation to distinguish paint from new RenderObjects

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index cb6890fc7fbb2181ff07bf906bad36f7c4adef6c..9f3b5e854dece7bd6745eecf80be1b74751674c3 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1672,6 +1672,10 @@ InvalidationReason RenderObject::invalidatePaintIfNeeded(const RenderLayerModelO
         return invalidationReason;
     }
 
+    if (view()->usesCompositing() && !hadPaintInvalidation())
+        paintInvalidationContainer.layer()->paintInvalidator().setBackingIncludesFirstPaintInvalidation();
+    setHadPaintInvalidation(true);
+
     fullyInvalidatePaint(paintInvalidationContainer, invalidationReason, oldBounds, newBounds);
     return invalidationReason;
 }