Add support for temporarily disabling sync.

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 <list>
 #include <string>
@@ skipping 462 matching lines @@
   virtual bool encryption_pending() const;
 
   // Returns whether processing changes is allowed.  Check this before doing
   // any model-modifying operations.
   bool ShouldPushChanges();
 
   const GURL& sync_service_url() const { return sync_service_url_; }
   SigninManager* signin() { return signin_.get(); }
   const std::string& cros_user() const { return cros_user_; }
 
+  // Stops the sync backend and sets the flag for suppressing sync startup.
+  void StopAndSuppress();
+
+  // Resets the flag for suppressing sync startup and starts the sync backend.
+  void UnsuppressAndStart();
+
   // Marks all currently registered types as "acknowledged" so we won't prompt
   // the user about them any more.
   void AcknowledgeSyncedTypes();
 
   SyncGlobalError* sync_global_error() { return sync_global_error_.get(); }
 
   virtual const FailedDatatypesHandler& failed_datatypes_handler();
 
  protected:
   // Used by test classes that derive from ProfileSyncService.
@@ skipping 41 matching lines @@
   // was required for encryption, decryption with a cached passphrase, or
   // because a new passphrase is required?
   sync_api::PassphraseRequiredReason passphrase_required_reason_;
 
  private:
   friend class ProfileSyncServicePasswordTest;
   friend class TestProfileSyncService;
   friend class ProfileSyncServiceForWizardTest;
   FRIEND_TEST_ALL_PREFIXES(ProfileSyncServiceTest, InitialState);
 
+  // Starts up sync if it is not suppressed and preconditions are met.
+  // Called from Initialize() and UnsuppressAndStart().
+  void TryStart();
+
   // Called when we've determined that we don't need a passphrase (either
   // because OnPassphraseAccepted() was called, or because we've gotten a
   // OnPassphraseRequired() but no data types are enabled).
   void ResolvePassphraseRequired();
 
   // If |delete_sync_data_folder| is true, then this method will delete all
   // previous "Sync Data" folders. (useful if the folder is partial/corrupt).
   void InitializeBackend(bool delete_sync_data_folder);
 
   // Initializes the various settings from the command line.
@@ skipping 149 matching lines @@
   FailedDatatypesHandler failed_datatypes_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const browser_sync::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_