Load credentials on desktop even when there is no authenticated account ID.

components/signin/core/browser/profile_oauth2_token_service.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 COMPONENTS_SIGNIN_CORE_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 24 matching lines @@
   ProfileOAuth2TokenService(
       std::unique_ptr<OAuth2TokenServiceDelegate> delegate);
   ~ProfileOAuth2TokenService() override;
 
   // KeyedService implementation.
   void Shutdown() override;
 
   // Loads credentials from a backing persistent store to make them available
   // after service is used between profile restarts.
   //
-  // Only call this method if there is at least one account connected to the
-  // profile, otherwise startup will cause unneeded work on the IO thread. The
-  // primary account is specified with the |primary_account_id| argument. If
-  // empty, no credentials will be loaded. For a regular profile, the primary
-  // account id comes from SigninManager. For a supervised user, the id comes
-  // from SupervisedUserService.
+  // The primary account is specified with the |primary_account_id| argument.
+  // For a regular profile, the primary account id comes from SigninManager.
+  // For a supervised user, the id comes from SupervisedUserService.
   virtual void LoadCredentials(const std::string& primary_account_id);
 
   // Updates a |refresh_token| for an |account_id|. Credentials are persisted,
   // and available through |LoadCredentials| after service is restarted.
   virtual void UpdateCredentials(const std::string& account_id,
                                  const std::string& refresh_token);
 
   virtual void RevokeCredentials(const std::string& account_id);
 
   // Returns a pointer to its instance of net::BackoffEntry or nullptr if there
   // is no such instance.
   const net::BackoffEntry* GetDelegateBackoffEntry();
 
  private:
   void OnRefreshTokenAvailable(const std::string& account_id) override;
   void OnRefreshTokenRevoked(const std::string& account_id) override;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileOAuth2TokenService);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_H_