Add old_state parameter to CustomButton::StateChanged

ui/app_list/views/tile_item_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 "ui/app_list/views/tile_item_view.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/views/app_list_main_view.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/image_view.h"
@@ skipping 71 matching lines @@
   }
 
   icon_->SetImage(icon);
 }
 
 void TileItemView::SetTitle(const base::string16& title) {
   title_->SetText(title);
   SetAccessibleName(title);
 }
 
-void TileItemView::StateChanged() {
+void TileItemView::StateChanged(ButtonState old_state) {
   UpdateBackgroundColor();
 }
 
 void TileItemView::Layout() {
   gfx::Rect rect(GetContentsBounds());
 
   rect.Inset(0, kTopPadding, 0, 0);
   icon_->SetBoundsRect(rect);
 
   rect.Inset(0, kGridIconDimension + kIconTitleSpacing, 0, 0);
@@ skipping 42 matching lines @@
   // truncation in making the tooltip. We do not want the label itself to have a
   // tooltip, so we only temporarily enable it to get the tooltip text from the
   // label, then disable it again.
   title_->SetHandlesTooltips(true);
   bool handled = title_->GetTooltipText(p, tooltip);
   title_->SetHandlesTooltips(false);
   return handled;
 }
 
 }  // namespace app_list