LabelButton: cache the last computed preferred size

ui/views/controls/button/checkbox.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/checkbox.h"
 
 #include "grit/ui_resources.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/views/controls/button/label_button_border.h"
@@ skipping 49 matching lines @@
   // Checked/Focused images.
   SetCustomImage(true, true, STATE_NORMAL,
                  *rb.GetImageSkiaNamed(IDR_CHECKBOX_FOCUSED_CHECKED));
   SetCustomImage(true, true, STATE_HOVERED,
                  *rb.GetImageSkiaNamed(IDR_CHECKBOX_FOCUSED_CHECKED_HOVER));
   SetCustomImage(true, true, STATE_PRESSED,
                  *rb.GetImageSkiaNamed(IDR_CHECKBOX_FOCUSED_CHECKED_PRESSED));
 
   // Limit the checkbox height to match the legacy appearance.
   const gfx::Size preferred_size(LabelButton::GetPreferredSize());
-  set_min_size(gfx::Size(0, preferred_size.height() + 4));
+  SetMinSize(gfx::Size(0, preferred_size.height() + 4));
 }
 
 Checkbox::~Checkbox() {
 }
 
 void Checkbox::SetChecked(bool checked) {
   checked_ = checked;
   UpdateImage();
 }
 
@@ skipping 57 matching lines @@
 ui::NativeTheme::Part Checkbox::GetThemePart() const {
   return ui::NativeTheme::kCheckbox;
 }
 
 void Checkbox::GetExtraParams(ui::NativeTheme::ExtraParams* params) const {
   LabelButton::GetExtraParams(params);
   params->button.checked = checked_;
 }
 
 }  // namespace views