Added merge session request throttle for XHR requests

chrome/browser/chromeos/login/merge_session_load_page.h

 // Copyright (c) 2013 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_CHROMEOS_LOGIN_MERGE_SESSION_LOAD_PAGE_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_MERGE_SESSION_LOAD_PAGE_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
+#include "chrome/browser/chromeos/login/merge_session_throttle.h"
 #include "chrome/browser/chromeos/login/oauth2_login_manager.h"
 #include "content/public/browser/interstitial_page_delegate.h"
 #include "url/gurl.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
 class InterstitialPage;
 class WebContents;
 }
 
 namespace extensions {
 class Extension;
 }
 
 namespace chromeos {
 
 // MergeSessionLoadPage class shows the interstitial page that is shown
 // while we are trying to restore session containing tabs with Google properties
 // during the process of exchanging OAuth2 refresh token for user cookies.
 // It deletes itself when the interstitial page is closed.
 class MergeSessionLoadPage
     : public content::InterstitialPageDelegate,
       public OAuth2LoginManager::Observer {
  public:
-  // Passed a boolean indicating whether or not it is OK to proceed with the
-  // page load.
-  typedef base::Closure CompletionCallback;
-
   // Create a merge session load delay page for the |web_contents|.
   // The |callback| will be run on the IO thread.
-  MergeSessionLoadPage(content::WebContents* web_contents,
-                       const GURL& url,
-                       const CompletionCallback& callback);
+  MergeSessionLoadPage(
+      content::WebContents* web_contents,
+      const GURL& url,
+      const MergeSessionThrottle::CompletionCallback& callback);
 
   void Show();
 
  protected:
   virtual ~MergeSessionLoadPage();
 
  private:
   friend class TestMergeSessionLoadPage;
 
   // InterstitialPageDelegate implementation.
   virtual std::string GetHTMLContents() OVERRIDE;
   virtual void CommandReceived(const std::string& command) OVERRIDE;
   virtual void OverrideRendererPrefs(
       content::RendererPreferences* prefs) OVERRIDE;
   virtual void OnProceed() OVERRIDE;
   virtual void OnDontProceed() OVERRIDE;
 
   // OAuth2LoginManager::Observer overrides.
   virtual void OnSessionRestoreStateChanged(
       Profile* user_profile,
       OAuth2LoginManager::SessionRestoreState state) OVERRIDE;
 
   void NotifyBlockingPageComplete();
 
   // Helper function to get OAuth2LoginManager out of |web_contents_|.
   OAuth2LoginManager* GetOAuth2LoginManager();
 
-  CompletionCallback callback_;
+  MergeSessionThrottle::CompletionCallback callback_;
 
   // True if the proceed is chosen.
   bool proceeded_;
 
   content::WebContents* web_contents_;
   GURL url_;
   content::InterstitialPage* interstitial_page_;  // Owns us.
 
   DISALLOW_COPY_AND_ASSIGN(MergeSessionLoadPage);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MERGE_SESSION_LOAD_PAGE_H_