Remove race condition when installing default apps into a new profile.

chrome/browser/extensions/default_apps_provider.h

+// Copyright (c) 2011 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_DEFAULT_APPS_PROVIDER_H_
+#define CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_PROVIDER_H_
+#pragma once
+
+#include "chrome/browser/extensions/external_extension_provider_impl.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class ExternalExtensionLoader;
+class PrefService;
+class Profile;
+
+namespace base {
+class DictionaryValue;
+}
+
+// A provider of apps that are installed by default into all new profiles.
+class DefaultAppsProvider : public ExternalExtensionProviderImpl,
+                            public content::NotificationObserver {
+ public:
+  // These values are persisted in the user preferences so values should not
+  // be changed.
+  enum InstallState {
+    kInstallNotStarted,
+    kInstalling,
+    kInstallDone
+  };
+
+  DefaultAppsProvider(VisitorInterface* service,
+                      ExternalExtensionLoader* loader,
+                      Profile* profile);
+  virtual ~DefaultAppsProvider();
+
+  // Register preference properties used by DefaultAppsProvider to maintain
+  // install state.
+  static void RegisterUserPrefs(PrefService* prefs);
+
+  // Determines whether default apps should be installed into the specified
+  // profile.  If true, then an instance of DefaultAppsProvider should be
+  // added to the external providers list.
+  static bool ShouldRegister(Profile* profile);
+
+  // ExternalExtensionProviderImpl overrides:
+  virtual void SetPrefs(base::DictionaryValue* prefs) OVERRIDE;
+  virtual void ServiceShutdown() OVERRIDE;
+  virtual void VisitRegisteredExtension() const OVERRIDE;
+
+  // Implementation of NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Used only for testing.
+  const std::set<std::string>& install_error_extensions() const {
+    return install_error_extensions_;
+  }
+
+ private:
+  Profile* profile_;
+  content::NotificationRegistrar registrar_;
+
+  // Set of extensions that failed to install for some reason.
+  std::set<std::string> install_error_extensions_;
+
+  DISALLOW_COPY_AND_ASSIGN(DefaultAppsProvider);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_PROVIDER_H_