Added arrow key navigation to Overview Mode

ash/wm/overview/transparent_activate_window_button.cc

 // Copyright 2014 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 "ash/wm/overview/transparent_activate_window_button.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/window_state.h"
 #include "ui/views/controls/button/custom_button.h"
@@ skipping 35 matching lines @@
 
   return widget;
 }
 
 }  // namespace
 
 TransparentActivateWindowButton::TransparentActivateWindowButton(
     aura::Window* activate_window)
     : event_handler_widget_(InitEventHandler(activate_window->GetRootWindow())),
       activate_window_(activate_window) {
-  views::View* transparent_button = new TransparentButton(this);
+  views::Button* transparent_button =
+      new TransparentButton(this);
+  transparent_button->SetAccessibleName(activate_window->title());
   event_handler_widget_->SetContentsView(transparent_button);
 }
 
 void TransparentActivateWindowButton::SetBounds(const gfx::Rect& bounds) {
   event_handler_widget_->SetBounds(bounds);
 }
 
+void TransparentActivateWindowButton::SendFocusAlert() const {
+  event_handler_widget_->GetContentsView()->
+      NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
+}
+
 TransparentActivateWindowButton::~TransparentActivateWindowButton() {
 }
 
 void TransparentActivateWindowButton::ButtonPressed(views::Button* sender,
                                                     const ui::Event& event) {
   wm::GetWindowState(activate_window_)->Activate();
 }
 
 }  // namespace ash