Add accessibility support for Textfields in Windows.

views/controls/textfield/native_textfield_win.h

Index: views/controls/textfield/native_textfield_win.h
===================================================================
--- views/controls/textfield/native_textfield_win.h	(revision 49543)
+++ views/controls/textfield/native_textfield_win.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -10,6 +10,7 @@
 #include <atlcrack.h>
 #include <atlctrls.h>
 #include <atlmisc.h>
+#include <oleacc.h>
 #include <tom.h>  // For ITextDocument, a COM interface to CRichEditCtrl
 #include <vsstyle.h>
 
@@ -71,6 +72,11 @@
                                           menus::Accelerator* accelerator);
   virtual void ExecuteCommand(int command_id);
 
+  // Update accessibility information.
+  void InitializeAccessibilityInfo();
+  void UpdateAccessibleState(uint32 state_flag, bool set_value);
+  void UpdateAccessibleValue(const std::wstring& value);
+
   // CWindowImpl
   BEGIN_MSG_MAP(Edit)
     MSG_WM_CHAR(OnChar)
@@ -217,6 +223,9 @@
 
   COLORREF bg_color_;
 
+  //  The accessibility state of this object.
+  int accessibility_state_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeTextfieldWin);
 };