Implement base class for app_list items.

chrome/browser/ui/app_list/arc/arc_app_item.h

 // Copyright 2015 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 CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_ITEM_H_
 #define CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_ITEM_H_
 
 #include <string>
 
 #include "base/macros.h"
-#include "chrome/browser/ui/app_list/app_list_syncable_service.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_icon.h"
+#include "chrome/browser/ui/app_list/chrome_app_list_item.h"
 #include "ui/app_list/app_list_item.h"
 
-namespace content {
-class BrowserContext;
-}  // content
+class Profile;
 
 // ArcAppItem represents an ARC app in app list.
-class ArcAppItem : public app_list::AppListItem,
+class ArcAppItem : public ChromeAppListItem,
                    public ArcAppIcon::Observer {
  public:
   static const char kItemType[];
 
-  ArcAppItem(content::BrowserContext* context,
+  ArcAppItem(Profile* profile,
              const app_list::AppListSyncableService::SyncItem* sync_item,
              const std::string& id,
              const std::string& name,
              bool ready);
   ~ArcAppItem() override;
 
   void SetName(const std::string& name);
 
   void Activate(int event_flags) override;
   const char* GetItemType() const override;
 
   ArcAppIcon* arc_app_icon() { return arc_app_icon_.get(); }
 
   bool ready() const { return ready_; }
 
   void SetReady(bool ready);
 
   // ArcAppIcon::Observer
   void OnIconUpdated() override;
 
  private:
   // Updates the app item's icon, if necessary making it gray.
   void UpdateIcon();
 
-  content::BrowserContext* context_;
+  // Set the position from the ordering.
+  void UpdatePositionFromOrdering();
+
   bool ready_;
   scoped_ptr<ArcAppIcon> arc_app_icon_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAppItem);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_ITEM_H_