Lazily build the app list model.

chrome/browser/ui/app_list/extension_app_model_builder.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_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_
 #define CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 27 matching lines @@
 // This class populates and maintains the given |model| with information from
 // |profile|.
 class ExtensionAppModelBuilder : public extensions::InstallObserver,
                                  public extensions::ExtensionRegistryObserver,
                                  public app_list::AppListItemListObserver {
  public:
   explicit ExtensionAppModelBuilder(AppListControllerDelegate* controller);
   ~ExtensionAppModelBuilder() override;
 
   // Initialize to use app-list sync and sets |service_| to |service|.
-  void InitializeWithService(app_list::AppListSyncableService* service);
+  void InitializeWithService(app_list::AppListSyncableService* service,
+                             app_list::AppListModel* model);
 
   // Initialize to use extension sync and sets |service_| to NULL. Used in
   // tests and when AppList sync is not enabled.
   void InitializeWithProfile(Profile* profile, app_list::AppListModel* model);
 
  private:
   typedef std::vector<ExtensionAppItem*> ExtensionAppList;
 
   // Builds the model with the current profile.
   void BuildModel();
@@ skipping 70 matching lines @@
   // We listen to this to show app installing progress.
   extensions::InstallTracker* tracker_;
 
   // Listen extension's load, unload, uninstalled.
   extensions::ExtensionRegistry* extension_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppModelBuilder);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_