Implement Composition interface for IME API

Source/core/html/ime/Composition.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define Composition_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
+class InputMethodContext;
+
 class Composition : public RefCounted<Composition>, public ScriptWrappable {
 public:
-    static PassRefPtr<Composition> create();
+    static PassRefPtr<Composition> create(InputMethodContext*);
     ~Composition();
 
-    String text() const { return m_text; }
-    void setText(const String& text) { m_text = text; }
-
-    int selectionStart() const { return m_selectionStart; }
-    void setSelectionStart(int selectionStart) { selectionStart = m_selectionStart; }
-
-    int selectionEnd() const { return m_selectionEnd; }
-    void setSelectionEnd(int selectionEnd) { selectionEnd = m_selectionEnd; }
-
+    String text() const;
+    int selectionStart() const;
+    int selectionEnd() const;
     const Vector<unsigned>& getSegments() const;
 
 private:
-    Composition();
+    explicit Composition(InputMethodContext*);
 
-    String m_text;
-    int m_selectionStart;
-    int m_selectionEnd;
-    Vector<unsigned> m_segments;
+    InputMethodContext* m_inputMethodContext;
 };
 
 } // namespace WebCore
 
 #endif // Composition_h