Avoid repeatedly deriving fonts in the LabelButton ctor.

ui/views/controls/button/label_button.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/label_button.h"
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "ui/gfx/animation/throb_animation.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/sys_color_change_listener.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/painter.h"
 #include "ui/views/window/dialog_delegate.h"
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "ui/views/linux_ui/linux_ui.h"
 #endif
 
 namespace {
 
 // The default spacing between the icon and text.
 const int kSpacing = 5;
 
 #if !(defined(OS_LINUX) && !defined(OS_CHROMEOS))
 // Default text and shadow colors for STYLE_BUTTON.
 const SkColor kStyleButtonTextColor = SK_ColorBLACK;
 const SkColor kStyleButtonShadowColor = SK_ColorWHITE;
 #endif
 
+const gfx::FontList& GetDefaultNormalFontList() {
+  static base::LazyInstance<gfx::FontList>::Leaky font_list =
+      LAZY_INSTANCE_INITIALIZER;
+  return font_list.Get();
+}
+
+const gfx::FontList& GetDefaultBoldFontList() {
+  static base::LazyInstance<gfx::FontList>::Leaky font_list =
+      LAZY_INSTANCE_INITIALIZER;
+  if ((font_list.Get().GetFontStyle() & gfx::Font::BOLD) == 0) {
+    font_list.Get() = font_list.Get().
+        DeriveWithStyle(font_list.Get().GetFontStyle() | gfx::Font::BOLD);
+    DCHECK_NE(font_list.Get().GetFontStyle() & gfx::Font::BOLD, 0);
+  }
+  return font_list.Get();
+}
+
 }  // namespace
 
 namespace views {
 
 // static
 const int LabelButton::kHoverAnimationDurationMs = 170;
 
 // static
 const char LabelButton::kViewClassName[] = "LabelButton";
 
 LabelButton::LabelButton(ButtonListener* listener, const base::string16& text)
     : CustomButton(listener),
       image_(new ImageView()),
       label_(new Label()),
+      cached_normal_font_list_(GetDefaultNormalFontList()),
+      cached_bold_font_list_(GetDefaultBoldFontList()),
       button_state_images_(),
       button_state_colors_(),
       explicitly_set_colors_(),
       is_default_(false),
       style_(STYLE_TEXTBUTTON),
       border_is_themed_border_(true),
       image_label_spacing_(kSpacing) {
   SetAnimationDuration(kHoverAnimationDurationMs);
   SetText(text);
-  SetFontList(gfx::FontList());
 
   AddChildView(image_);
   image_->set_interactive(false);
 
   AddChildView(label_);
+  label_->SetFontList(cached_normal_font_list_);
   label_->SetAutoColorReadabilityEnabled(false);
   label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 
   // Initialize the colors, border, and layout.
   SetStyle(style_);
 
   SetAccessibleName(text);
 }
 
 LabelButton::~LabelButton() {}
@@ skipping 417 matching lines @@
   GetExtraParams(params);
   return ui::NativeTheme::kHovered;
 }
 
 void LabelButton::ResetCachedPreferredSize() {
   cached_preferred_size_valid_ = false;
   cached_preferred_size_= gfx::Size();
 }
 
 }  // namespace views