[sync] Make SetSetupInProgress kick sync engine when needed

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 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 CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 261 matching lines @@
   // if the user is customizing sync after already completing setup once).
   // ProfileSyncService uses this to determine if it's OK to start syncing, or
   // if the user is still setting up the initial sync configuration.
   virtual bool FirstSetupInProgress() const;
 
   // Called by the UI to notify the ProfileSyncService that UI is visible so it
   // will not start syncing. This tells sync whether it's safe to start
   // downloading data types yet (we don't start syncing until after sync setup
   // is complete). The UI calls this as soon as any part of the signin wizard is
   // displayed (even just the login UI).
-  void set_setup_in_progress(bool setup_in_progress) {
-      setup_in_progress_ = setup_in_progress;
-  }
+  // If |setup_in_progress| is false, this also kicks the sync engine to ensure
+  // that data download starts.
+  virtual void SetSetupInProgress(bool setup_in_progress);
 
   // Returns true if the SyncBackendHost has told us it's ready to accept
   // changes.
   // [REMARK] - it is safe to call this function only from the ui thread.
   // because the variable is not thread safe and should only be accessed from
   // single thread. If we want multiple threads to access this(and there is
   // currently no need to do so) we need to protect this with a lock.
   // TODO(timsteele): What happens if the bookmark model is loaded, a change
   // takes place, and the backend isn't initialized yet?
   virtual bool sync_initialized() const;
@@ skipping 462 matching lines @@
   browser_sync::Experiments current_experiments;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const browser_sync::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_