Make ChromeSigninClient a BrowserContextKeyedService

chrome/browser/signin/chrome_signin_client_factory.h

+// Copyright 2014 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_SIGNIN_CHROME_SIGNIN_CLIENT_FACTORY_H_
+#define CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_CLIENT_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/signin/chrome_signin_client.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+class Profile;
+
+// Singleton that owns all ChromeSigninClients and associates them with
+// Profiles.
+class ChromeSigninClientFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns the instance of ChromeSigninClient associated with this profile
+  // (creating one if none exists). Returns NULL if this profile cannot have an
+  // ChromeSigninClient (for example, if |profile| is incognito).
+  static ChromeSigninClient* GetForProfile(Profile* profile);
+
+  // Returns an instance of the factory singleton.
+  static ChromeSigninClientFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ChromeSigninClientFactory>;
+
+  ChromeSigninClientFactory();
+  virtual ~ChromeSigninClientFactory();
+
+  // BrowserContextKeyedServiceFactory:
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_CLIENT_FACTORY_H_