Issue trace events to gather repaint information.

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index a4d483d79055044d9442017b0163d0681bb7a0f1..f8c9cdcd132219b518ae09bbaadd42dc788efe30 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -1069,6 +1069,16 @@ private:
     void checkBlockPositionedObjectsNeedLayout();
 #endif
 
+    enum InvalidationReason {
+        InvalidationIncremental,
+        InvalidationSelfLayout,
+        InvalidationBorderFitLines,
+        InvalidationBorderRadius,
+        InvalidationBoundsChangeWithBackground,
+        InvalidationBoundsChange
+    };
+    const char* invalidationReasonToString(const InvalidationReason) const;
+
     RefPtr<RenderStyle> m_style;
 
     Node* m_node;