Introduce InsertIncrementalTextCommand to respect existing style for composition

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

 /*
  * Copyright (C) 2006, 2007, 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 92 matching lines @@
   void deleteSurroundingText(int before, int after);
   WebTextInputInfo textInputInfo() const;
   WebTextInputType textInputType() const;
 
  private:
   Document& document() const;
   bool isAvailable() const;
 
   Member<LocalFrame> m_frame;
   Member<Range> m_compositionRange;
-  bool m_isDirty;
   bool m_hasComposition;
 
   explicit InputMethodController(LocalFrame&);
 
   Editor& editor() const;
   LocalFrame& frame() const {
     DCHECK(m_frame);
     return *m_frame;
   }
 
@@ skipping 12 matching lines @@
   // Inserts the given text string in the place of the existing composition
   // and moves caret. Returns true if did replace and moved caret successfully.
   bool replaceCompositionAndMoveCaret(const String&, int relativeCaretPosition);
 
   // Returns true if moved caret successfully.
   bool moveCaret(int newCaretPosition);
 
   PlainTextRange createSelectionRangeForSetComposition(int selectionStart,
                                                        int selectionEnd,
                                                        size_t textLength) const;
-  void setCompositionWithIncrementalText(const String&,
-                                         const Vector<CompositionUnderline>&,
-                                         int selectionStart,
-                                         int selectionEnd);
   int textInputFlags() const;
   WebTextInputMode inputModeOfFocusedElement() const;
 
   // Implements |SynchronousMutationObserver|.
   void contextDestroyed() final;
 };
 
 }  // namespace blink
 
 #endif  // InputMethodController_h