Address bug where the one-click sign-in bar would never show again once

chrome/browser/ui/sync/one_click_signin_helper.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_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 10 matching lines @@
 // Per-tab one-click signin helper.  When a user signs in to a Google service
 // and the profile is not yet connected to a Google account, will start the
 // process of helping the user connect his profile with one click.  The process
 // begins with an infobar and is followed with a confirmation dialog explaining
 // more about what this means.
 class OneClickSigninHelper : public content::WebContentsObserver {
  public:
   // Returns true if the one-click signin feature can be offered at this time.
   // It can be offered if the contents is not in an incognito window.  If
   // |check_connected| is true, then the profile is checked to see if it's
-  // already connected to a google account, in which case a one click signin
+  // already connected to a google account or if the user has already rejected
+  // one-click sign-in with this email, in which cases a one click signin
   // should not be offered.
   static bool CanOffer(content::WebContents* web_contents,
+                       const std::string& email,
                        bool check_connected);
 
   // Looks for the Google-Accounts-SignIn response header, and if found,
   // tries to display an infobar in the tab contents identified by the
   // child/route id.
   static void ShowInfoBarIfPossible(net::URLRequest* request,
                                     int child_id,
                                     int route_id);
 
   explicit OneClickSigninHelper(content::WebContents* web_contents);
@@ skipping 21 matching lines @@
 
   // Information about the account that has just logged in.
   std::string session_index_;
   std::string email_;
   std::string password_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_