Add a non-blocking "OneShotEvent" class

chrome/browser/extensions/test_extension_system.cc

 // 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.
 
 #include "chrome/browser/extensions/test_extension_system.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/blacklist.h"
 #include "chrome/browser/extensions/event_router.h"
@@ skipping 82 matching lines @@
       new StandardManagementPolicyProvider(ExtensionPrefs::Get(profile_)));
   management_policy_.reset(new ManagementPolicy());
   management_policy_->RegisterProvider(
       standard_management_policy_provider_.get());
   extension_service_.reset(new ExtensionService(profile_,
                                                 command_line,
                                                 install_directory,
                                                 ExtensionPrefs::Get(profile_),
                                                 blacklist_.get(),
                                                 autoupdate_enabled,
-                                                true));
+                                                true,
+                                                &ready_));
   extension_service_->ClearProvidersForTesting();
   return extension_service_.get();
 }
 
 ExtensionService* TestExtensionSystem::extension_service() {
   return extension_service_.get();
 }
 
 ManagementPolicy* TestExtensionSystem::management_policy() {
   return management_policy_.get();
@@ skipping 55 matching lines @@
 }
 
 ExtensionWarningService* TestExtensionSystem::warning_service() {
   return NULL;
 }
 
 Blacklist* TestExtensionSystem::blacklist() {
   return blacklist_.get();
 }
 
+const OneShotEvent& TestExtensionSystem::ready() const {
+  return ready_;
+}
+
 // static
 ProfileKeyedService* TestExtensionSystem::Build(
     content::BrowserContext* profile) {
   return new TestExtensionSystem(static_cast<Profile*>(profile));
 }
 
 }  // namespace extensions