Add method for identifying different InfoBars

chrome/browser/password_manager/auto_signin_first_run_infobar_delegate.h

 // Copyright 2015 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_PASSWORD_MANAGER_AUTO_SIGNIN_FIRST_RUN_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_AUTO_SIGNIN_FIRST_RUN_INFOBAR_DELEGATE_H_
 
 #include "base/macros.h"
 #include "chrome/browser/password_manager/password_manager_infobar_delegate.h"
 
 namespace content {
 class WebContents;
 }
 
 // This delegate provides and acts on data for the android only auto sign-in
 // first run experience infobar.
 class AutoSigninFirstRunInfoBarDelegate
     : public PasswordManagerInfoBarDelegate {
  public:
   static void Create(content::WebContents* web_contents,
                      const base::string16& message);
 
   ~AutoSigninFirstRunInfoBarDelegate() override;
 
+  std::string GetIdentifier() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
 
   base::string16 GetExplanation() { return explanation_; }
 
  protected:
   // Makes a ctor available in tests.
   AutoSigninFirstRunInfoBarDelegate(content::WebContents* web_contents,
                                     bool is_smart_lock_branding_available,
                                     const base::string16& message);
 
  private:
   base::string16 explanation_;
 
   content::WebContents* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoSigninFirstRunInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_AUTO_SIGNIN_FIRST_RUN_INFOBAR_DELEGATE_H_