Test aria-pressed=mixed on windows

ui/views/controls/button/image_button.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/button/image_button.h"
 
 #include <utility>
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
@@ skipping 271 matching lines @@
   base::string16 name;
   GetTooltipText(gfx::Point(), &name);
   node_data->SetName(name);
 
   // Use the visual pressed image as a cue for making this control into an
   // accessible toggle button.
   if ((toggled_ && !images_[ButtonState::STATE_NORMAL].isNull()) ||
       (!toggled_ && !alternate_images_[ButtonState::STATE_NORMAL].isNull())) {
     node_data->role = ui::AX_ROLE_TOGGLE_BUTTON;
     if (toggled_)
-      node_data->AddState(ui::AX_STATE_PRESSED);
+      node_data->AddIntAttribute(ui::AX_ATTR_PRESSED_STATE,
+                                 ui::AX_BUTTON_STATE_TRUE);
   }
 }
 
 }  // namespace views