Add old_state parameter to CustomButton::StateChanged

ui/chromeos/ime/candidate_view.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 "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/ime/candidate_window.h"
 #include "ui/chromeos/ime/candidate_view.h"
 #include "ui/chromeos/ime/candidate_window_constants.h"
 #include "ui/gfx/color_utils.h"
@@ skipping 207 matching lines @@
       if (view != this)
         view->SetHighlighted(false);
     }
   } else {
     set_background(NULL);
     SetBorder(views::CreateEmptyBorder(1, 1, 1, 1));
   }
   SchedulePaint();
 }
 
-void CandidateView::StateChanged() {
+void CandidateView::StateChanged(ButtonState old_state) {
   shortcut_label_->SetEnabled(state() != STATE_DISABLED);
   if (state() == STATE_PRESSED)
     SetHighlighted(true);
 }
 
 const char* CandidateView::GetClassName() const {
   return "CandidateView";
 }
 
 bool CandidateView::OnMouseDragged(const ui::MouseEvent& event) {
@@ skipping 63 matching lines @@
   }
 
   // Reserves the margin for infolist_icon even if it's not visible.
   size.Enlarge(
       kInfolistIndicatorIconWidth + kInfolistIndicatorIconPadding * 2, 0);
   return size;
 }
 
 }  // namespace ime
 }  // namespace ui