[ios] Allow having multiple session windows in a session.

ios/chrome/browser/sessions/session_service_ios.h

 // Copyright 2012 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 IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_IOS_H_
 #define IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_IOS_H_
 
 #import <Foundation/Foundation.h>
 
 #include "base/sequenced_task_runner.h"
 
-@class SessionWindowIOS;
+@class SessionIOS;
 
 // A singleton service for saving the current session. Can either save on a
 // delay or immediately. Saving is always performed on a separate thread.
 @interface SessionServiceIOS : NSObject
 
 // Lazily creates a singleton instance with a default task runner.
 + (SessionServiceIOS*)sharedService;
 
 // Initializes a SessionServiceIOS with a given task runner. Prefer to use the
 // |sharedService| method.
 - (instancetype)initWithTaskRunner:
     (const scoped_refptr<base::SequencedTaskRunner>&)taskRunner
     NS_DESIGNATED_INITIALIZER;
 
-// Saves the session represented by |sessionWindow| to |directory| on disk. If
-// |immediately| is NO, the save is done after a delay. If another call is
-// pending, this one is ignored. If YES, the save is done now, cancelling any
-// pending calls.  Either way, the save is done on a separate thread to avoid
-// blocking the UI thread.
-- (void)saveSessionWindow:(SessionWindowIOS*)sessionWindow
-                directory:(NSString*)directory
-              immediately:(BOOL)immediately;
+// Saves the session represented by |session| to |directory|. If |immediately|
+// is NO, the save is done after a delay. If another call is pending, this one
+// is ignored. If YES, the save is done now, cancelling any pending calls.
+// Either way, the save is done on a separate thread to avoid blocking the UI
+// thread.
+- (void)saveSession:(SessionIOS*)sessionWindow
+          directory:(NSString*)directory
+        immediately:(BOOL)immediately;
 
-// Loads the session window from default session file in |directory| on the
-// main thread. Returns nil in case of errors.
-- (SessionWindowIOS*)loadSessionWindowFromDirectory:(NSString*)directory;
+// Loads the session from default session file in |directory| on the main
+// thread. Returns nil in case of errors.
+- (SessionIOS*)loadSessionFromDirectory:(NSString*)directory;
 
-// Loads the session window from |sessionPath| on the main thread. Returns nil
-// in case of errors.
-- (SessionWindowIOS*)loadSessionWindowFromPath:(NSString*)sessionPath;
+// Loads the session from |sessionPath| on the main thread. Returns nil in case
+// of errors.
+- (SessionIOS*)loadSessionFromPath:(NSString*)sessionPath;
 
 // Schedules deletion of the file containing the last session in |directory|.
 - (void)deleteLastSessionFileInDirectory:(NSString*)directory;
 
 // Returns the path of the session file for |directory|.
 + (NSString*)sessionPathForDirectory:(NSString*)directory;
 
 @end
 
 @interface SessionServiceIOS (SubClassing)
 
 // For some of the unit tests, we need to make sure the session is saved
 // immediately so we can read it back in to verify various attributes. This
 // is not a situation we normally expect to be in because we never
 // want the session being saved on the main thread in the production app.
 - (void)performSaveSessionData:(NSData*)sessionData
                    sessionPath:(NSString*)sessionPath;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_IOS_H_