Invalidate previous paint rect in RenderObject::paintInvalidationForWholeRenderer()

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 d0fab2e388e5d315914104eb7a911e29a24816aa..50437bbb4fdbd80abd290dbba282cc369dba9fc6 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -991,6 +991,8 @@ public:
 
     const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }

[Xianzhu, 2014/07/16 01:59:49]

For now we can't ASSERT(savesPreviousPaintInvalidationRect()) here because
RenderLayerRepainter may fail it.

     void setPreviousPaintInvalidationRect(const LayoutRect& rect) { m_previousPaintInvalidationRect = rect; }
+    // For now only RenderBox and RenderSVGModelObject always set previousPaintInvalidationRect.
+    bool savesPreviousPaintInvalidationRect() const { return isBox() || isSVG(); }
 
     const LayoutPoint& previousPositionFromPaintInvalidationContainer() const { return m_previousPositionFromPaintInvalidationContainer; }
     void setPreviousPositionFromPaintInvalidationContainer(const LayoutPoint& location) { m_previousPositionFromPaintInvalidationContainer = location; }