Reland of Make FrameSelection to hold non-canonicalized positions

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

 /*
  * Copyright (C) 2004, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 40 matching lines @@
 
 class CORE_EXPORT FrameCaret final
     : public GarbageCollectedFinalized<FrameCaret> {
  public:
   FrameCaret(LocalFrame&, const SelectionEditor&);
   ~FrameCaret();
 
   const DisplayItemClient& displayItemClient() const;
   bool isActive() const { return caretPosition().isNotNull(); }
 
-  void updateAppearance();
+  void scheduleVisualUpdateForPaintInvalidationIfNeeded();
 
   // Used to suspend caret blinking while the mouse is down.
   void setCaretBlinkingSuspended(bool suspended) {
     m_isCaretBlinkingSuspended = suspended;
   }
   bool isCaretBlinkingSuspended() const { return m_isCaretBlinkingSuspended; }
   void stopCaretBlinkTimer();
   void startBlinkCaret();
   void setCaretVisibility(CaretVisibility);
   IntRect absoluteCaretBounds() const;
@@ skipping 20 matching lines @@
   DECLARE_TRACE();
 
  private:
   friend class FrameSelectionTest;
 
   const PositionWithAffinity caretPosition() const;
 
   bool shouldBlinkCaret() const;
   void caretBlinkTimerFired(TimerBase*);
   bool caretPositionIsValidForDocument(const Document&) const;
-
-  void scheduleVisualUpdateForPaintInvalidationIfNeeded();
+  void updateAppearance();
 
   const Member<const SelectionEditor> m_selectionEditor;
   const Member<LocalFrame> m_frame;
   const std::unique_ptr<CaretDisplayItemClient> m_displayItemClient;
   CaretVisibility m_caretVisibility;
   // TODO(https://crbug.com/668758): Consider using BeginFrame update for this.
   TaskRunnerTimer<FrameCaret> m_caretBlinkTimer;
   bool m_shouldPaintCaret : 1;
   bool m_isCaretBlinkingSuspended : 1;
   bool m_shouldShowBlockCursor : 1;
 
   DISALLOW_COPY_AND_ASSIGN(FrameCaret);
 };
 
 }  // namespace blink
 
 #endif  // FrameCaret_h