Added a system caret used for accessibility on Windows.

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/controls/textfield/textfield.h"
 
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 328 matching lines @@
   SchedulePaint();
   NotifyAccessibilityEvent(ui::AX_EVENT_VALUE_CHANGED, true);
 }
 
 void Textfield::AppendText(const base::string16& new_text) {
   if (new_text.empty())
     return;
   model_->Append(new_text);
   OnCaretBoundsChanged();
   SchedulePaint();
+  NotifyAccessibilityEvent(ui::AX_EVENT_TEXT_CHANGED, true);
 }
 
 void Textfield::InsertOrReplaceText(const base::string16& new_text) {
   if (new_text.empty())
     return;
   model_->InsertText(new_text);
   UpdateAfterChange(true, true);
 }
 
 base::string16 Textfield::GetSelectedText() const {
@@ skipping 1761 matching lines @@
   cursor_blink_timer_.Stop();
 }
 
 void Textfield::OnCursorBlinkTimerFired() {
   DCHECK(ShouldBlinkCursor());
   cursor_view_.SetVisible(!cursor_view_.visible());
   UpdateCursorViewPosition();
 }
 
 }  // namespace views