Avoid repainting non needs-self-layout container

Source/core/rendering/LayoutRepainter.h

Index: Source/core/rendering/LayoutRepainter.h
diff --git a/Source/core/rendering/LayoutRepainter.h b/Source/core/rendering/LayoutRepainter.h
index 55fdd1eb23a674d0d57b2bdff214b9d2d48d7d69..aa8138f024801c716a09759dbd7733ade811a3b2 100644
--- a/Source/core/rendering/LayoutRepainter.h
+++ b/Source/core/rendering/LayoutRepainter.h
@@ -30,6 +30,7 @@
 
 namespace WebCore {
 
+class RenderBox;
 class RenderLayerModelObject;
 class RenderObject;
 
@@ -43,12 +44,18 @@ public:
     bool repaintAfterLayout();
 
 private:
+    bool canSkipRepaint() const;
+
     RenderObject& m_object;
     RenderLayerModelObject* m_repaintContainer;
     // We store these values as LayoutRects, but the final invalidations will be pixel snapped
     LayoutRect m_oldBounds;
     LayoutRect m_oldOutlineBox;
     bool m_checkForRepaint;
+
+    LayoutUnit m_logicalWidth;
+    LayoutUnit m_logicalHeight;
+    bool m_selfNeededLayout;
 };
 
 } // namespace WebCore