LabelButton: cache the last computed preferred size

ui/views/examples/button_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/button_example.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ skipping 83 matching lines @@
   } else if (event.IsShiftDown()) {
     if (event.IsAltDown()) {
       label_button_->SetFocusable(!label_button_->IsFocusable());
     } else {
       label_button_->SetStyle(static_cast<Button::ButtonStyle>(
           (label_button_->style() + 1) % Button::STYLE_COUNT));
     }
   } else if (event.IsAltDown()) {
     label_button_->SetIsDefault(!label_button_->is_default());
   } else {
-    label_button_->set_min_size(gfx::Size());
+    label_button_->SetMinSize(gfx::Size());
   }
   example_view()->GetLayoutManager()->Layout(example_view());
 }
 
 void ButtonExample::ButtonPressed(Button* sender, const ui::Event& event) {
   if (sender == label_button_)
     LabelButtonPressed(event);
   else
     PrintStatus("Image Button Pressed! count: %d", ++count_);
 }
 
 }  // namespace examples
 }  // namespace views