[repaint-after-layout] Only repaint SVG root element when needed.

Source/core/rendering/LayoutRectRecorder.h

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 #include "wtf/Noncopyable.h"
 
 namespace WebCore {
 
 class RenderLayerModelObject;
 class RenderObject;
 
 class LayoutRectRecorder {
     WTF_MAKE_NONCOPYABLE(LayoutRectRecorder);
 public:
-    LayoutRectRecorder(RenderObject&, bool skipRecording = false);
+    LayoutRectRecorder(RenderObject&, bool record = true);
     ~LayoutRectRecorder();
 
     static bool shouldRecordLayoutRects();
 
 private:
     RenderObject& m_object;
-    bool m_skipRecording;
+    bool m_record;
 };
 
 } // namespace WebCore
 
 #endif // LayoutRectRecorder_h