cros: Don't send duplicate UserSession mojo messages to ash

chrome/browser/ui/ash/session_controller_client.h

 // Copyright 2016 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_UI_ASH_SESSION_CONTROLLER_CLIENT_H_
 #define CHROME_BROWSER_UI_ASH_SESSION_CONTROLLER_CLIENT_H_
 
 #include "ash/public/interfaces/session_controller.mojom.h"
 #include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
@@ skipping 77 matching lines @@
   static bool ShouldLockScreenAutomatically();
   static ash::AddUserSessionPolicy GetAddUserSessionPolicy();
   static void DoLockScreen();
   static void DoSwitchActiveUser(const AccountId& account_id);
   static void DoCycleActiveUser(ash::CycleUserDirection direction);
 
   // Flushes the mojo pipe to ash.
   static void FlushForTesting();
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(SessionControllerClientTest, SendUserSession);
   FRIEND_TEST_ALL_PREFIXES(SessionControllerClientTest, SupervisedUser);
 
   // Called when the login profile is ready.
   void OnLoginUserProfilePrepared(Profile* profile);
 
   // Sends the user session info for a given profile.
   void SendUserSessionForProfile(Profile* profile);
 
   // Connects to the |session_controller_| interface.
   void ConnectToSessionController();
@@ skipping 15 matching lines @@
 
   // Whether the primary user session info is sent to ash.
   bool primary_user_session_sent_ = false;
 
   // If the session is for a supervised user, the profile of that user.
   // Chrome OS only supports a single supervised user in a session.
   Profile* supervised_user_profile_ = nullptr;
 
   content::NotificationRegistrar registrar_;
 
+  // Used to suppress duplicate IPCs to ash.
   ash::mojom::SessionInfoPtr last_sent_session_info_;
+  ash::mojom::UserSessionPtr last_sent_user_session_;
 
   base::WeakPtrFactory<SessionControllerClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionControllerClient);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SESSION_CONTROLLER_CLIENT_H_