Refactor Textfield and AutocompleteEditViewViews.

views/controls/textfield/textfield_controller.h

 // Copyright (c) 2011 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_CONTROLLER_H_
 #define VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_
 #pragma once
 
 #include "base/string16.h"
 
 namespace views {
 
 class KeyEvent;
 class Textfield;
 
 // This defines the callback interface for other code to be notified of changes
 // in the state of a text field.
 class TextfieldController {
  public:
   // This method is called whenever the text in the field changes.
   virtual void ContentsChanged(Textfield* sender,
                                const string16& new_contents) = 0;
 
   // This method is called to get notified about keystrokes in the edit.
   // Returns true if the message was handled and should not be processed
   // further. If it returns false the processing continues.
   virtual bool HandleKeyEvent(Textfield* sender,
                               const KeyEvent& key_event) = 0;
+
+  // Called before performing a user action that may change the textfield.
+  // It's currently only supported by Views implementation.
+  virtual void OnBeforeUserAction(Textfield* sender) {}
+
+  // Called after performing a user action that may change the textfield.
+  // It's currently only supported by Views implementation.
+  virtual void OnAfterUserAction(Textfield* sender) {}
+
+ protected:
+  virtual ~TextfieldController() {}
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_