Extract Profile-independent GCMService from GCMProfileService

chrome/browser/invalidation/invalidation_auth_provider.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_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();
 
+    // Calls when the user logs in.
+    virtual void OnInvalidationAuthLogin() {}
+
     // Called when the user logs out.
-    virtual void OnInvalidationAuthLogout() = 0;
+    virtual void OnInvalidationAuthLogout() {}
   };
 
   virtual ~InvalidationAuthProvider();
 
   // Gets the token service vending tokens for authentication to the cloud.
   virtual OAuth2TokenService* GetTokenService() = 0;
 
+  // Gets the username to use for authentication.
+  virtual std::string GetUsername() = 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();
 
+  // Fires an OnInvalidationAuthLogin notification.
+  void FireInvalidationAuthLogin();
+
   // 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_