Add a new constructor to KeyEvent.

views/controls/textfield/native_textfield_win.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_NATIVE_TEXTFIELD_WIN_H_
 #define VIEWS_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlapp.h>
@@ skipping 169 matching lines @@
   void OnMouseMove(UINT keys, const CPoint& point);
   int OnNCCalcSize(BOOL w_param, LPARAM l_param);
   void OnNCPaint(HRGN region);
   void OnNonLButtonDown(UINT keys, const CPoint& point);
   void OnPaste();
   void OnSetFocus(HWND hwnd);
   void OnSysChar(TCHAR ch, UINT repeat_count, UINT flags);
 
   // Helper function for OnChar() and OnKeyDown() that handles keystrokes that
   // could change the text in the edit.
-  void HandleKeystroke(UINT message, TCHAR key, UINT repeat_count, UINT flags);
+  // Note: This function assumes GetCurrentMessage() returns a MSG with
+  // msg > WM_KEYFIRST and < WM_KEYLAST.
+  void HandleKeystroke();
 
   // Every piece of code that can change the edit should call these functions
   // before and after the change.  These functions determine if anything
   // meaningful changed, and do any necessary updating and notification.
   void OnBeforePossibleChange();
 
   // When a user types a BIDI mirroring character (e.g. left parenthesis
   // U+0028, which should be rendered as '(' in LTR context unless  surrounded
   // by RTL characters in both sides, and it should be rendered as ')' in RTL
   // context unless surrounded by LTR characters in both sides.), the textfield
@@ skipping 72 matching lines @@
 
   //  The accessibility state of this object.
   int accessibility_state_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTextfieldWin);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_WIN_H_