New InvalidationReasons: InvalidationBecameVisible and InvalidationBecameInvisible

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 94 matching lines @@
 typedef unsigned MapCoordinatesFlags;
 
 enum InvalidationReason {
     InvalidationNone,
     InvalidationIncremental,
     InvalidationFull,
     InvalidationBorderFitLines,
     InvalidationBorderBoxChange,
     InvalidationBoundsChange,
     InvalidationLocationChange,
+    InvalidationBecameVisible,
+    InvalidationBecameInvisible,
     InvalidationScroll,
     InvalidationSelection,
     InvalidationLayer,
     InvalidationRendererRemoval,
     InvalidationPaintRectangle
 };
 
 const int caretWidth = 1;
 
 struct AnnotatedRegionValue {
@@ skipping 1430 matching lines @@
 void showTree(const blink::RenderObject*);
 void showLineTree(const blink::RenderObject*);
 void showRenderTree(const blink::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h