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 7ffb86cf19aca82d227df40ec668be67628ae97a..025133bb906e3b23fbd2a464c3dd189ba44aba9d 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -1072,6 +1072,16 @@ private:
     void checkBlockPositionedObjectsNeedLayout();
 #endif
 
+    enum RepaintReason {
+        RepaintNone,
+        RepaintSelfLayout,
+        RepaintBorderFitLines,
+        RepaintBorderRadius,
+        RepaintOutlineBoxChange,
+        RepaintBoundsChange
+    };
+    const char* repaintReasonToString(const RepaintReason) const;
+
     RefPtr<RenderStyle> m_style;
 
     Node* m_node;