Make CaretBase a DisplayItemClient.

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 34 matching lines @@
 
     // 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) override;
     bool isCaretBoundsDirty() const { return m_caretRectDirty; }
     void setCaretRectNeedsUpdate();
-    void invalidateCaretRect();
+    void invalidateCaretRect(bool forceInvalidation);

[chrishtr, 2016/09/01 23:45:58]

Document briefly.

[wkorman, 2016/09/02 00:02:46]

Done.

     IntRect absoluteCaretBounds();
 
     bool shouldShowBlockCursor() const { return m_shouldShowBlockCursor; }
     void setShouldShowBlockCursor(bool);
 
     void paintCaret(GraphicsContext&, const LayoutPoint&);
 
     void dataWillChange(const CharacterData&);
     void nodeWillBeRemoved(Node&);
 
@@ skipping 24 matching lines @@
     Timer<FrameCaret> m_caretBlinkTimer;
     bool m_caretRectDirty : 1;
     bool m_shouldPaintCaret : 1;
     bool m_isCaretBlinkingSuspended : 1;
     bool m_shouldShowBlockCursor : 1;
 };
 
 } // namespace blink
 
 #endif // FrameCaret_h