Add old_state parameter to CustomButton::StateChanged

ui/app_list/views/tile_item_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_APP_LIST_VIEWS_TILE_ITEM_VIEW_H_
 #define UI_APP_LIST_VIEWS_TILE_ITEM_VIEW_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 31 matching lines @@
 
   // Informs the TileItemView of its parent's background color. The controls
   // within the TileItemView will adapt to suit the given color.
   void SetParentBackgroundColor(SkColor color);
   SkColor parent_background_color() { return parent_background_color_; }
 
   // Sets the behavior of the tile item on mouse hover.
   void SetHoverStyle(HoverStyle hover_style);
 
   // Overridden from views::CustomButton:
-  void StateChanged() override;
+  void StateChanged(ButtonState old_state) override;
 
   // Overridden from views::View:
   void Layout() override;
 
   // Overridden from ImageShadowAnimator::Delegate:
   void ImageShadowAnimationProgressed(ImageShadowAnimator* animator) override;
 
  protected:
   void SetIcon(const gfx::ImageSkia& icon);
 
@@ skipping 14 matching lines @@
   views::Label* title_;     // Owned by views hierarchy.
 
   bool selected_;
 
   DISALLOW_COPY_AND_ASSIGN(TileItemView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_TILE_ITEM_VIEW_H_