First implementation of the paint slimming update algorithm

Source/core/paint/ViewDisplayList.h

Index: Source/core/paint/ViewDisplayList.h
diff --git a/Source/core/paint/ViewDisplayList.h b/Source/core/paint/ViewDisplayList.h
index 582fca092c6ab36a8ace865f7a15784f69153bf9..f5b553994e8e2256a260c08913964e29c6bf5384 100644
--- a/Source/core/paint/ViewDisplayList.h
+++ b/Source/core/paint/ViewDisplayList.h
@@ -93,11 +93,12 @@ public:
 #endif
 
 private:
-    bool isRepaint(PaintList::iterator, const DisplayItem&);
-    // Update m_paintList with any invalidations or new paints.
+    PaintList::iterator findRepaintWithoutInvalidation(PaintList::iterator, const DisplayItem&);

[chrishtr, 2014/10/31 21:30:11]

This one deserves documentation.

+    bool wasInvalidated(const DisplayItem&) const;
     void updatePaintList();
 
     PaintList m_paintList;
+    HashSet<const RenderObject*> m_paintListRenderers;
     HashSet<const RenderObject*> m_invalidated;
     PaintList m_newPaints;
 };