Add a non-blocking "OneShotEvent" class

chrome/browser/extensions/test_extension_system.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_TEST_EXTENSION_SYSTEM_H_
 #define CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_SYSTEM_H_
 
 #include "chrome/browser/extensions/extension_system.h"
 
 class CommandLine;
@@ skipping 52 matching lines @@
   virtual LazyBackgroundTaskQueue* lazy_background_task_queue() OVERRIDE;
   virtual EventRouter* event_router() OVERRIDE;
   virtual RulesRegistryService* rules_registry_service() OVERRIDE;
   virtual ApiResourceManager<SerialConnection>* serial_connection_manager()
       OVERRIDE;
   virtual ApiResourceManager<Socket>* socket_manager() OVERRIDE;
   virtual ApiResourceManager<UsbDeviceResource>* usb_device_resource_manager()
       OVERRIDE;
   virtual ExtensionWarningService* warning_service() OVERRIDE;
   virtual Blacklist* blacklist() OVERRIDE;
+  virtual const OneShotEvent& ready() const OVERRIDE;
 
   // Factory method for tests to use with SetTestingProfile.
   static ProfileKeyedService* Build(content::BrowserContext* profile);
 
  protected:
   Profile* profile_;
 
  private:
   scoped_ptr<StateStore> state_store_;
   scoped_ptr<ShellWindowGeometryCache> shell_window_geometry_cache_;
   scoped_ptr<Blacklist> blacklist_;
   scoped_ptr<StandardManagementPolicyProvider>
       standard_management_policy_provider_;
   scoped_ptr<ManagementPolicy> management_policy_;
   scoped_ptr<ExtensionService> extension_service_;
   scoped_ptr<ExtensionProcessManager> extension_process_manager_;
   scoped_refptr<ExtensionInfoMap> info_map_;
   scoped_ptr<ApiResourceManager<Socket> > socket_manager_;
+  OneShotEvent ready_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_SYSTEM_H_