Add old_state parameter to CustomButton::StateChanged

ui/app_list/views/app_list_item_view.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/app_list/views/app_list_item_view.h"
 
 #include <algorithm>
 
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 288 matching lines @@
 
   if (!apps_grid_view_->IsSelectedView(this))
     apps_grid_view_->ClearAnySelectedView();
   context_menu_runner_.reset(new views::MenuRunner(
       menu_model, views::MenuRunner::HAS_MNEMONICS | views::MenuRunner::ASYNC));
   context_menu_runner_->RunMenuAt(GetWidget(), NULL,
                                   gfx::Rect(point, gfx::Size()),
                                   views::MENU_ANCHOR_TOPLEFT, source_type);
 }
 
-void AppListItemView::StateChanged() {
+void AppListItemView::StateChanged(ButtonState old_state) {
   if (state() == STATE_HOVERED || state() == STATE_PRESSED) {
     shadow_animator_.animation()->Show();
     // Show the hover/tap highlight: for tap, lighter highlight replaces darker
     // keyboard selection; for mouse hover, keyboard selection takes precedence.
     if (!apps_grid_view_->IsSelectedView(this) || state() == STATE_PRESSED)
       SetItemIsHighlighted(true);
   } else {
     shadow_animator_.animation()->Hide();
     SetItemIsHighlighted(false);
     if (item_weak_)
@@ skipping 195 matching lines @@
   SetItemPercentDownloaded(item_weak_->percent_downloaded());
 }
 
 void AppListItemView::ItemBeingDestroyed() {
   DCHECK(item_weak_);
   item_weak_->RemoveObserver(this);
   item_weak_ = NULL;
 }
 
 }  // namespace app_list