[Extensions] Ensure ordering of extension [un]loaded, activated messages

chrome/browser/extensions/extension_service.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_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 47 matching lines @@
 class CrxInstaller;
 class ExtensionActionStorageManager;
 class ExtensionDownloader;
 class ExtensionDownloaderDelegate;
 class ExtensionErrorController;
 class ExtensionRegistry;
 class ExtensionSystem;
 class ExtensionUpdater;
 class ExternalInstallManager;
 class OneShotEvent;
+class RendererStartupHelper;
 class SharedModuleService;
 class UpdateObserver;
 }  // namespace extensions
 
 // This is an interface class to encapsulate the dependencies that
 // various classes have on ExtensionService. This allows easy mocking.
 class ExtensionServiceInterface
     : public base::SupportsWeakPtr<ExtensionServiceInterface> {
  public:
   virtual ~ExtensionServiceInterface() {}
@@ skipping 626 matching lines @@
 
   // Sequenced task runner for extension related file operations.
   scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
 
   std::unique_ptr<extensions::ExtensionActionStorageManager>
       extension_action_storage_manager_;
 
   // The SharedModuleService used to check for import dependencies.
   std::unique_ptr<extensions::SharedModuleService> shared_module_service_;
 
+  // The associated RendererStartupHelper. Guaranteed to outlive the
+  // ExtensionSystem, and thus us.
+  extensions::RendererStartupHelper* renderer_helper_;
+
   base::ObserverList<extensions::UpdateObserver, true> update_observers_;
 
   // Migrates app data when upgrading a legacy packaged app to a platform app
   std::unique_ptr<extensions::AppDataMigrator> app_data_migrator_;
 
   using InstallGateRegistry = std::map<extensions::ExtensionPrefs::DelayReason,
                                        extensions::InstallGate*>;
   InstallGateRegistry install_delayer_registry_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
@@ skipping 15 matching lines @@
                            GreylistUnknownDontChange);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            ManagementPolicyProhibitsEnableOnInstalled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            BlockAndUnblockBlacklistedExtension);
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_