Implement inline signin with iframe

chrome/browser/ui/sync/one_click_signin_sync_starter.cc

 // 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.
 
 #include "chrome/browser/ui/sync/one_click_signin_sync_starter.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 
@@ skipping 438 matching lines @@
     EnsureBrowser();
 
     // If the sign in tab is showing the native signin page or the blank page
     // for web-based flow, and is not about to be closed, use it to show the
     // settings UI.
     bool use_same_tab = false;
     if (web_contents()) {
       GURL current_url = web_contents()->GetLastCommittedURL();
       bool is_chrome_signin_url =
           current_url.GetOrigin().spec() == chrome::kChromeUIChromeSigninURL;
+      bool is_same_profile =
+          Profile::FromBrowserContext(web_contents()->GetBrowserContext()) ==
+          profile_;
       use_same_tab =
           (is_chrome_signin_url ||
            signin::IsContinueUrlForWebBasedSigninFlow(current_url)) &&
-          !signin::IsAutoCloseEnabledInURL(current_url);
+          !signin::IsAutoCloseEnabledInURL(current_url) &&
+          is_same_profile;
     }
     if (profile_sync_service) {
       // Need to navigate to the settings page and display the sync UI.
       if (use_same_tab) {
         ShowSettingsPageInWebContents(web_contents(),
                                       chrome::kSyncSetupSubPage);
       } else {
         // If the user is setting up sync for the first time, let them configure
         // advanced sync settings. However, in the case of re-authentication,
         // return the user to the settings page without showing any config UI.
@@ skipping 40 matching lines @@
                                 false);
   contents->OpenURL(params);
 
   // Activate the tab.
   Browser* browser = chrome::FindBrowserWithWebContents(contents);
   int content_index =
       browser->tab_strip_model()->GetIndexOfWebContents(contents);
   browser->tab_strip_model()->ActivateTabAt(content_index,
                                             false /* user_gesture */);
 }