MacViews: draw combobox arrow backgrounds

ui/views/examples/combobox_example.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/examples/combobox_example.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/views/controls/combobox/combobox.h"
 #include "ui/views/layout/box_layout.h"
@@ skipping 14 matching lines @@
 base::string16 ComboboxModelExample::GetItemAt(int index) {
   return base::UTF8ToUTF16(base::StringPrintf("Item %d", index));
 }
 
 ComboboxExample::ComboboxExample() : ExampleBase("Combo Box") {
 }
 
 ComboboxExample::~ComboboxExample() {
   // Delete |combobox_| first as it references |combobox_model_|.
   delete combobox_;
+  delete disabled_combobox_;
   delete action_combobox_;
   combobox_ = nullptr;
+  disabled_combobox_ = nullptr;
   action_combobox_ = nullptr;
 }
 
 void ComboboxExample::CreateExampleView(View* container) {
   combobox_ = new Combobox(&combobox_model_);
   combobox_->set_listener(this);
   combobox_->SetSelectedIndex(3);
 
+  disabled_combobox_ = new Combobox(&combobox_model_);
+  disabled_combobox_->set_listener(this);
+  disabled_combobox_->SetSelectedIndex(4);
+  disabled_combobox_->SetEnabled(false);
+
   action_combobox_ = new Combobox(&combobox_model_);
   action_combobox_->set_listener(this);
   action_combobox_->SetStyle(Combobox::STYLE_ACTION);
   // Note: STYLE_ACTION comboboxes always have the first item selected by
   // default.
 
   container->SetLayoutManager(new BoxLayout(
       BoxLayout::kVertical,
       1, 1, 1));
   container->AddChildView(combobox_);
+  container->AddChildView(disabled_combobox_);
   container->AddChildView(action_combobox_);
 }
 
 void ComboboxExample::OnPerformAction(Combobox* combobox) {
   if (combobox == combobox_) {
     PrintStatus("Selected: %s", base::UTF16ToUTF8(combobox_model_.GetItemAt(
         combobox->selected_index())).c_str());
   } else if (combobox == action_combobox_) {
     PrintStatus("Action: %s", base::UTF16ToUTF8(combobox_model_.GetItemAt(
         combobox->selected_index())).c_str());
   } else {
     NOTREACHED() << "Surprising combobox.";
   }
 }
 
 }  // namespace examples
 }  // namespace views