Move isRenderedCharacter() to EditorCommand.cpp from Position.cpp

Source/core/editing/commands/EditCommand.h

 /*
  * Copyright (C) 2005, 2006, 2008 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 45 matching lines @@
 
 protected:
     explicit EditCommand(Document&);
 
     Document& document() const { return *m_document.get(); }
     CompositeEditCommand* parent() const { return m_parent; }
     void setStartingSelection(const VisibleSelection&);
     void setEndingSelection(const VisibleSelection&);
     void setEndingSelection(const VisiblePosition&);
 
+    // TODO(yosin) |isRenderedCharacter()| should be removed, and we should use
+    // |VisiblePosition::characterAfter()| and
+    // |VisiblePosition::characterBefore()|.
+    static bool isRenderedCharacter(const Position&);
+
 private:
     RefPtrWillBeMember<Document> m_document;
     VisibleSelection m_startingSelection;
     VisibleSelection m_endingSelection;
     RawPtrWillBeMember<CompositeEditCommand> m_parent;
 };
 
 enum ShouldAssumeContentIsAlwaysEditable {
     AssumeContentIsAlwaysEditable,
     DoNotAssumeContentIsAlwaysEditable,
 };
 
 class SimpleEditCommand : public EditCommand {
 public:
     virtual void doUnapply() = 0;
     virtual void doReapply(); // calls doApply()
 
 protected:
     explicit SimpleEditCommand(Document& document) : EditCommand(document) { }
 
 private:
     bool isSimpleEditCommand() const final { return true; }
 };
 
 DEFINE_TYPE_CASTS(SimpleEditCommand, EditCommand, command, command->isSimpleEditCommand(), command.isSimpleEditCommand());
 
 } // namespace blink
 
 #endif // EditCommand_h