[Sync] Add support for enabling session sync remotely.

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 2011 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_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 189 matching lines @@
   virtual void OnStopSyncingPermanently() OVERRIDE;
   virtual void OnClearServerDataFailed() OVERRIDE;
   virtual void OnClearServerDataSucceeded() OVERRIDE;
   virtual void OnPassphraseRequired(
       sync_api::PassphraseRequiredReason reason) OVERRIDE;
   virtual void OnPassphraseAccepted() OVERRIDE;
   virtual void OnEncryptionComplete(
       const syncable::ModelTypeSet& encrypted_types) OVERRIDE;
   virtual void OnMigrationNeededForTypes(
       const syncable::ModelTypeSet& types) OVERRIDE;
+  virtual void OnDataTypesChanged(
+      const syncable::ModelTypeSet& to_add) OVERRIDE;
 
   void OnClearServerDataTimeout();
 
   // Called when a user enters credentials through UI.
   virtual void OnUserSubmittedAuth(const std::string& username,
                                    const std::string& password,
                                    const std::string& captcha,
                                    const std::string& access_code);
 
   // Update the last auth error and notify observers of error state.
@@ skipping 323 matching lines @@
   // Initializes the various settings from the command line.
   void InitSettings();
 
   // Sets the last synced time to the current time.
   void UpdateLastSyncedTime();
 
   void NotifyObservers();
 
   static const char* GetPrefNameForDataType(syncable::ModelType data_type);
 
+  // About-flags experiment names for datatypes that aren't enabled by default
+  // yet.
+  static std::string GetExperimentNameForDataType(
+      syncable::ModelType data_type);
+
+  // Create and register a new datatype controller.
+  void RegisterNewDataType(syncable::ModelType data_type);
+
   // Time at which we begin an attempt a GAIA authorization.
   base::TimeTicks auth_start_time_;
 
   // Time at which error UI is presented for the new tab page.
   base::TimeTicks auth_error_time_;
 
   // Factory used to create various dependent objects.
   ProfileSyncFactory* factory_;
 
   // The profile whose data we are synchronizing.
@@ skipping 86 matching lines @@
   // and cached until the syncer either finishes encryption
   // (OnEncryptionComplete) or the user cancels.
   syncable::ModelTypeSet pending_types_for_encryption_;
 
   scoped_ptr<browser_sync::BackendMigrator> migrator_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_