Implement clipboard features in views textfield.

views/controls/textfield/textfield_views_model.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #define VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 108 matching lines @@
 
   // Clears selection.
   void ClearSelection();
 
   // Returns visible text. If the field is password, it returns the
   // sequence of "*".
   string16 GetVisibleText() const {
     return GetVisibleText(0U, text_.length());
   }
 
+  // Cuts the currently selected text and puts it to clipboard. Returns true
+  // if text has changed after cutting.
+  bool Cut();
+
+  // Copies the currently selected text and puts it to clipboard.
+  void Copy();
+
+  // Pastes text from the clipboard at current cursor position. Returns true
+  // if text has changed after pasting.
+  bool Paste();
+
  private:
   friend class NativeTextfieldViews;
 
   // Tells if any text is selected.
   bool HasSelection() const;
 
   // Deletes the selected text.
   void DeleteSelection();
 
   // Returns the visible text given |start| and |end|.
@@ skipping 10 matching lines @@
 
   // True if the text is the password.
   bool is_password_;
 
   DISALLOW_COPY_AND_ASSIGN(TextfieldViewsModel);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_