Add old_state parameter to CustomButton::StateChanged

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 <stddef.h>
 
 #include <utility>
 
@@ skipping 440 matching lines @@
     const {
   return UseFloodFillInkDrop()
              ? base::MakeUnique<views::InkDropHighlight>(
                    size(), kInkDropSmallCornerRadius,
                    gfx::RectF(GetLocalBounds()).CenterPoint(),
                    GetInkDropBaseColor())
              : CreateDefaultInkDropHighlight(
                    gfx::RectF(image()->GetMirroredBounds()).CenterPoint());
 }
 
-void LabelButton::StateChanged() {
+void LabelButton::StateChanged(ButtonState old_state) {
   const gfx::Size previous_image_size(image_->GetPreferredSize());
   UpdateImage();
   ResetLabelEnabledColor();
   label_->SetEnabled(state() != STATE_DISABLED);
   if (image_->GetPreferredSize() != previous_image_size)
     Layout();
 }
 
 void LabelButton::GetExtraParams(ui::NativeTheme::ExtraParams* params) const {
   params->button.checked = false;
@@ skipping 132 matching lines @@
           : PlatformStyle::TextColorForButton(button_state_colors_, *this);
   if (state() != STATE_DISABLED && label_->enabled_color() != color)
     label_->SetEnabledColor(color);
 }
 
 bool LabelButton::UseFloodFillInkDrop() const {
   return !GetText().empty();
 }
 
 }  // namespace views