MacViews: Implement Full Keyboard Access.

ui/views/controls/menu/menu_controller_unittest.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 "ui/views/controls/menu/menu_controller.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 439 matching lines @@
     return menu_controller_->exit_type_;
   }
 
   void AddButtonMenuItems() {
     menu_item()->SetBounds(0, 0, 200, 300);
     MenuItemView* item_view =
         menu_item()->AppendMenuItemWithLabel(5, base::ASCIIToUTF16("Five"));
     for (int i = 0; i < 3; ++i) {
       LabelButton* button =
           new LabelButton(nullptr, base::ASCIIToUTF16("Label"));
+      // This is an in-menu button. Hence it must be always focusable.
       button->SetFocusBehavior(View::FocusBehavior::ALWAYS);
       item_view->AddChildView(button);
     }
     menu_item()->GetSubmenu()->ShowAt(owner(), menu_item()->bounds(), false);
   }
 
   CustomButton* GetHotButton() {
     return menu_controller_->hot_button_;
   }
 
@@ skipping 765 matching lines @@
   DestroyMenuControllerOnMenuClosed(nested_delegate.get());
   controller->OnGestureEvent(sub_menu, &event);
 
   // Close to remove observers before test TearDown
   sub_menu->Close();
   EXPECT_EQ(1, nested_delegate->on_menu_closed_called());
 }
 
 }  // namespace test
 }  // namespace views