[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 ef5eff0c9382fa1936b18ef0a068a38efb8e531f..018435d6d78f62ed37de3945d41c8498a9bb234a 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -515,6 +515,7 @@ 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();