Update CrOS logout button for MD.

ui/views/controls/button/md_text_button.cc

 // Copyright 2015 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/md_text_button.h"
 
 #include "base/i18n/case_conversion.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_utils.h"
@@ skipping 188 matching lines @@
 bool MdTextButton::ShouldShowInkDropForFocus() const {
   // These types of button use |focus_ring_|.
   return false;
 }
 
 void MdTextButton::SetEnabledTextColors(SkColor color) {
   LabelButton::SetEnabledTextColors(color);
   UpdateColors();
 }
 
+void MdTextButton::AdjustFontSize(int size_delta) {
+  LabelButton::AdjustFontSize(size_delta);
+  UpdatePaddingForFont();
+}
+
 void MdTextButton::UpdateStyleToIndicateDefaultStatus() {
   UpdateColors();
 }
 
+void MdTextButton::SetFontList(const gfx::FontList& font_list) {
+  NOTREACHED()
+      << "Don't call MdTextButton::SetFontList (it will soon be protected)";
+}
+
 MdTextButton::MdTextButton(ButtonListener* listener)
     : LabelButton(listener, base::string16()),
       focus_ring_(new internal::MdFocusRing()),
       is_cta_(false) {
   SetInkDropMode(InkDropMode::ON);
   set_has_ink_drop_action_on_click(true);
   SetHorizontalAlignment(gfx::ALIGN_CENTER);
   SetFocusForPlatform();
   SetMinSize(gfx::Size(kMinWidth, 0));
   SetFocusPainter(nullptr);
   label()->SetAutoColorReadabilityEnabled(false);
-  SetFontList(GetMdFontList());
-
   AddChildView(focus_ring_);
   focus_ring_->SetVisible(false);
   set_request_focus_on_press(false);
+  LabelButton::SetFontList(GetMdFontList());
+  UpdatePaddingForFont();
+}
 
+MdTextButton::~MdTextButton() {}
+
+void MdTextButton::UpdatePaddingForFont() {
   // Top and bottom padding depend on the font. Example: if font cap height is
   // 9dp, use 8dp bottom padding and 7dp top padding to total 24dp.
   const gfx::FontList& font = label()->font_list();
   int text_height = font.GetCapHeight();
   int even_text_height = text_height - (text_height % 2);
   const int top_padding = even_text_height - (text_height - even_text_height);
   const int bottom_padding = even_text_height;
   DCHECK_EQ(3 * even_text_height, top_padding + text_height + bottom_padding);
 
   const int inbuilt_top_padding = font.GetBaseline() - font.GetCapHeight();
   const int inbuilt_bottom_padding =
       font.GetHeight() - label()->font_list().GetBaseline();
 
   // TODO(estade): can we get rid of the platform style border hoopla if
   // we apply the MD treatment to all buttons, even GTK buttons?
   SetBorder(Border::CreateEmptyBorder(
       top_padding - inbuilt_top_padding, kHorizontalPadding,
       bottom_padding - inbuilt_bottom_padding, kHorizontalPadding));
 }
 
-MdTextButton::~MdTextButton() {}
-
 void MdTextButton::UpdateColors() {
   ui::NativeTheme::ColorId fg_color_id =
       is_cta_ ? ui::NativeTheme::kColorId_TextOnCallToActionColor
               : ui::NativeTheme::kColorId_ButtonEnabledColor;
 
   ui::NativeTheme* theme = GetNativeTheme();
   if (!explicitly_set_normal_color())
     LabelButton::SetEnabledTextColors(theme->GetSystemColor(fg_color_id));
 
   SkColor text_color = label()->enabled_color();
@@ skipping 11 matching lines @@
   SkColor stroke_color = (is_cta_ || color_utils::IsDark(text_color))
                              ? SkColorSetA(SK_ColorBLACK, kStrokeOpacity)
                              : SkColorSetA(SK_ColorWHITE, 2 * kStrokeOpacity);
 
   set_background(Background::CreateBackgroundPainter(
       true, Painter::CreateRoundRectWith1PxBorderPainter(
                 bg_color, stroke_color, kInkDropSmallCornerRadius)));
 }
 
 }  // namespace views