Make invalidations work for Chrome OS Kiosk Apps.

chrome/browser/invalidation/invalidation_auth_provider.h

+// Copyright (c) 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_INVALIDATION_INVALIDATION_AUTH_PROVIDER_H_
+#define CHROME_BROWSER_INVALIDATION_INVALIDATION_AUTH_PROVIDER_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+
+class OAuth2TokenService;
+
+namespace invalidation {
+
+// Encapsulates authentication-related dependencies of InvalidationService
+// implementations so different implementations can be used for regular Profiles
+// and Chrome OS Kiosk Apps.
+class InvalidationAuthProvider {
+ public:
+  class Observer {
+   public:
+    virtual ~Observer();
+
+    // Called when the user logs out.
+    virtual void OnInvalidationAuthLogout() = 0;
+  };
+
+  virtual ~InvalidationAuthProvider();
+
+  // Gets the token service vending tokens for authentication to the cloud.
+  virtual OAuth2TokenService* GetTokenService() = 0;
+
+  // Gets the account ID to use for authentication.
+  virtual std::string GetAccountId() = 0;
+
+  // Shows the login popup, returns true if successful.
+  virtual bool ShowLoginUI() = 0;
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+ protected:
+  InvalidationAuthProvider();

[pavely, 2014/03/07 23:43:29]

I don't understand reason for making ctor protected. Is it to prohibit creating
instances of this class?

[Mattias Nissler (ping if slow), 2014/03/08 01:30:07]

You can't create them anyways (it has pure virtual member functions), so the
ctor is only useful to derived classes, and declaring it protected seemed most
consistent with that :)

[pavely, 2014/03/08 23:35:18]

You could just have no ctor at all, less lines for reader to read. I leave it up
to you to leave it the way it is or change it.

+
+  // Fires an OnInvalidationAuthLogout notification.
+  void FireInvalidationAuthLogout();
+
+ private:
+  ObserverList<Observer, true> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(InvalidationAuthProvider);
+};
+
+}  // namespace invalidation
+
+#endif  // CHROME_BROWSER_INVALIDATION_INVALIDATION_AUTH_PROVIDER_H_