Add old_state parameter to CustomButton::StateChanged

ui/views/controls/button/label_button.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 
 #include <array>
 #include <memory>
 
@@ skipping 111 matching lines @@
   // Sets the font list used by this button.
   virtual void SetFontList(const gfx::FontList& font_list);
 
   // View:
   void OnPaint(gfx::Canvas* canvas) override;
   void OnFocus() override;
   void OnBlur() override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 
   // CustomButton:
-  void StateChanged() override;
+  void StateChanged(ButtonState old_state) override;
 
   // Fills |params| with information about the button.
   virtual void GetExtraParams(ui::NativeTheme::ExtraParams* params) const;
 
   // Resets colors from the NativeTheme, explicitly set colors are unchanged.
   virtual void ResetColorsFromNativeTheme();
 
   // Changes the visual styling of this button to reflect the state of
   // |is_default()|.
   virtual void UpdateStyleToIndicateDefaultStatus();
@@ skipping 101 matching lines @@
   gfx::HorizontalAlignment horizontal_alignment_;
 
   std::unique_ptr<Painter> focus_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(LabelButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_