No longer start BG mode until a BackgroundContents is loaded

chrome/browser/background/background_application_list_model.h

 // 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.
 
 #ifndef CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_
 #pragma once
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
-// Model for list of Background Applications, that is, Extensions with
-// kBackgroundPermission set, associated with a Profile.
+// Model for list of Background Applications associated with a Profile (i.e.
+// extensions with kBackgroundPermission set, or hosted apps with a
+// BackgroundContents).
 class BackgroundApplicationListModel : public content::NotificationObserver {
  public:
   // Observer is informed of changes to the model.  Users of the
   // BackgroundApplicationListModel should anticipate that associated data,
   // e. g. the Icon, may exist and yet not be immediately available.  When the
   // data becomes available, OnApplicationDataChanged will be invoked for all
   // Observers of the model.
   class Observer {
    public:
     // Invoked when data that the model associates with the extension, such as
@@ skipping 27 matching lines @@
   //       ExtensionIconSet::EXTENSION_ICON_BITTY.
   const SkBitmap* GetIcon(const Extension* extension);
 
   // Return the position of |extension| within this list model.
   int GetPosition(const Extension* extension) const;
 
   // Return the extension at the specified |position| in this list model.
   const Extension* GetExtension(int position) const;
 
   // Returns true if the passed extension is a background app.
-  static bool IsBackgroundApp(const Extension& extension);
+  static bool IsBackgroundApp(const Extension& extension,
+                              Profile* profile);
 
   // Dissociate observer from this model.
   void RemoveObserver(Observer* observer);
 
   ExtensionList::const_iterator begin() const {
     return extensions_.begin();
   }
 
   ExtensionList::const_iterator end() const {
     return extensions_.end();
@@ skipping 54 matching lines @@
   ApplicationMap applications_;
   ExtensionList extensions_;
   ObserverList<Observer> observers_;
   Profile* profile_;
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundApplicationListModel);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_