LabelButton: cache the last computed preferred size

chrome/browser/ui/views/location_bar/search_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 "chrome/browser/ui/views/location_bar/search_button.h"
 
 #include "grit/theme_resources.h"
 #include "ui/base/theme_provider.h"
 #include "ui/views/controls/button/label_button_border.h"
 
 SearchButton::SearchButton(views::ButtonListener* listener)
     : views::LabelButton(listener, base::string16()) {
   EnableCanvasFlippingForRTLUI(true);
   set_triggerable_event_flags(
       ui::EF_LEFT_MOUSE_BUTTON | ui::EF_MIDDLE_MOUSE_BUTTON);
   SetStyle(views::Button::STYLE_BUTTON);
   SetFocusable(false);
-  set_min_size(gfx::Size());
+  SetMinSize(gfx::Size());
   scoped_ptr<views::LabelButtonBorder> border(
       new views::LabelButtonBorder(style()));
   border->set_insets(gfx::Insets());
   const int kSearchButtonNormalImages[] = IMAGE_GRID(IDR_OMNIBOX_SEARCH_BUTTON);
   border->SetPainter(
       false, views::Button::STATE_NORMAL,
       views::Painter::CreateImageGridPainter(kSearchButtonNormalImages));
   const int kSearchButtonHoveredImages[] =
       IMAGE_GRID(IDR_OMNIBOX_SEARCH_BUTTON_HOVER);
   border->SetPainter(
       false, views::Button::STATE_HOVERED,
       views::Painter::CreateImageGridPainter(kSearchButtonHoveredImages));
   const int kSearchButtonPressedImages[] =
       IMAGE_GRID(IDR_OMNIBOX_SEARCH_BUTTON_PRESSED);
   border->SetPainter(
       false, views::Button::STATE_PRESSED,
       views::Painter::CreateImageGridPainter(kSearchButtonPressedImages));
   border->SetPainter(false, views::Button::STATE_DISABLED, NULL);
   border->SetPainter(true, views::Button::STATE_NORMAL, NULL);
   border->SetPainter(true, views::Button::STATE_HOVERED, NULL);
   border->SetPainter(true, views::Button::STATE_PRESSED, NULL);
   border->SetPainter(true, views::Button::STATE_DISABLED, NULL);
   SetBorder(border.PassAs<views::Border>());
   const int kSearchButtonWidth = 56;
-  set_min_size(gfx::Size(kSearchButtonWidth, 0));
+  SetMinSize(gfx::Size(kSearchButtonWidth, 0));
 }
 
 SearchButton::~SearchButton() {
 }
 
 void SearchButton::UpdateIcon(bool is_search) {
   SetImage(
       views::Button::STATE_NORMAL,
       *GetThemeProvider()->GetImageSkiaNamed(is_search ?
           IDR_OMNIBOX_SEARCH_BUTTON_LOUPE : IDR_OMNIBOX_SEARCH_BUTTON_ARROW));
   // Flip the arrow for RTL, but not the loupe.
   image()->EnableCanvasFlippingForRTLUI(!is_search);
 }