[Editing][CodeHealth] Extract new FrameCaret class from FrameSelection

third_party/WebKit/Source/core/editing/CaretBase.cpp

 /*
  * 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 25 matching lines @@
 #include "core/paint/PaintInfo.h"
 #include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 CaretBase::CaretBase(CaretVisibility visibility)
     : m_caretVisibility(visibility)
 {
 }
 
+CaretBase::~CaretBase() = default;
+
+DEFINE_TRACE(CaretBase)
+{
+}
+
 void CaretBase::clearCaretRect()
 {
     m_caretLocalRect = LayoutRect();
 }
 
 static inline bool caretRendersInsideNode(Node* node)
 {
     return node && !isDisplayInsideTable(node) && !editingIgnoresContent(node);
 }
 
@@ skipping 138 matching lines @@
     else
         element = node->parentElement();
 
     if (element && element->layoutObject())
         caretColor = element->layoutObject()->resolveColor(CSSPropertyColor);
 
     context.fillRect(FloatRect(drawingRect), caretColor);
 }
 
 } // namespace blink