Make PaintInvalidation a DocumentLifecyle state

Source/core/dom/DocumentLifecycle.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 40 matching lines @@
         StyleClean,
 
         InPreLayout,
         InPerformLayout,
         AfterPerformLayout,
         LayoutClean,
 
         InCompositingUpdate,
         CompositingClean,
 
+        InPaintInvalidation,
+        PaintInvalidationClean,
+
         // Once the document starts shuting down, we cannot return
         // to the style/layout/rendering states.
         Stopping,
         Stopped,
         Disposed,
     };
 
     class Scope {
         WTF_MAKE_NONCOPYABLE(Scope);
     public:
@@ skipping 85 matching lines @@
 }
 
 inline bool DocumentLifecycle::stateAllowsDetach() const
 {
     return m_state == VisualUpdatePending
         || m_state == InStyleRecalc
         || m_state == StyleClean
         || m_state == InPreLayout
         || m_state == LayoutClean
         || m_state == CompositingClean
+        || m_state == PaintInvalidationClean
         || m_state == Stopping;
 }
 
 }
 
 #endif