[sync] Add a polling mechanism to CredentialCacheService for on-the-fly sign in / sign out / reconf…

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
diff --git a/chrome/browser/sync/profile_sync_service.h b/chrome/browser/sync/profile_sync_service.h
index 3dee74f3a9686fad5632d1a997bac35a9899d7d0..ed358424d619e96909ddec9ee5c40b51223cedcd 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -524,6 +524,7 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
   const GURL& sync_service_url() const { return sync_service_url_; }
   bool auto_start_enabled() const { return auto_start_enabled_; }
   SigninManager* signin() const { return signin_; }
+  bool setup_in_progress() const { return setup_in_progress_; }
 
   // Stops the sync backend and sets the flag for suppressing sync startup.
   void StopAndSuppress();