Add old_state parameter to CustomButton::StateChanged

ui/chromeos/ime/candidate_view.h

 // 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.
 
 #ifndef UI_CHROMEOS_IME_CANDIDATE_VIEW_H_
 #define UI_CHROMEOS_IME_CANDIDATE_VIEW_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "ui/base/ime/candidate_window.h"
@@ skipping 23 matching lines @@
   // Sets infolist icon.
   void SetInfolistIcon(bool enable);
 
   void SetHighlighted(bool highlighted);
 
  private:
   friend class CandidateWindowViewTest;
   FRIEND_TEST_ALL_PREFIXES(CandidateWindowViewTest, ShortcutSettingTest);
 
   // Overridden from views::CustomButton:
-  void StateChanged() override;
+  void StateChanged(ButtonState old_state) override;
 
   // Overridden from View:
   const char* GetClassName() const override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
 
   // The orientation of the candidate view.
   ui::CandidateWindow::Orientation orientation_;
 
@@ skipping 13 matching lines @@
   int candidate_width_;
   bool highlighted_;
 
   DISALLOW_COPY_AND_ASSIGN(CandidateView);
 };
 
 }  // namespace ime
 }  // namespace ui
 
 #endif  // UI_CHROMEOS_IME_CANDIDATE_VIEW_H_