[Experiment] DCHECK clean layout tree in mostForward/BackwardCaretPosition

third_party/WebKit/Source/core/editing/FrameSelection.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 259 matching lines @@
 
   bool shouldShowBlockCursor() const;
   void setShouldShowBlockCursor(bool);
 
   // TODO(yosin): We should check DOM tree version and style version in
   // |FrameSelection::selection()| to make sure we use updated selection,
   // rather than having |updateIfNeeded()|. Once, we update all layout tests
   // to use updated selection, we should make |updateIfNeeded()| private.
   void updateIfNeeded();
 
+  bool inUpdateSelectionIfNeeded() const { return m_inUpdateSelectionIfNeeded; }
+
   DECLARE_TRACE();
 
  private:
   friend class FrameSelectionTest;
   friend class PaintControllerPaintTestForSlimmingPaintV1AndV2;
   friend class SelectionControllerTest;
   FRIEND_TEST_ALL_PREFIXES(PaintControllerPaintTestForSlimmingPaintV1AndV2,
                            FullDocumentPaintingWithCaret);
 
   explicit FrameSelection(LocalFrame&);
@@ skipping 44 matching lines @@
   Member<EditingStyle> m_typingStyle;
 
   bool m_focused : 1;
 
   // Controls text granularity used to adjust the selection's extent in
   // moveRangeSelectionExtent.
   std::unique_ptr<GranularityStrategy> m_granularityStrategy;
 
   const Member<FrameCaret> m_frameCaret;
   bool m_useSecureKeyboardEntryWhenActive = false;
+
+  bool m_inUpdateSelectionIfNeeded = false;
 };
 
 inline EditingStyle* FrameSelection::typingStyle() const {
   return m_typingStyle.get();
 }
 
 inline void FrameSelection::clearTypingStyle() {
   m_typingStyle.clear();
 }
 
 inline void FrameSelection::setTypingStyle(EditingStyle* style) {
   m_typingStyle = style;
 }
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::FrameSelection&);
 void showTree(const blink::FrameSelection*);
 #endif
 
 #endif  // FrameSelection_h