Add method for identifying different InfoBars

chrome/browser/banners/app_banner_infobar_delegate_desktop.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_BANNERS_APP_BANNER_INFOBAR_DELEGATE_DESKTOP_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_INFOBAR_DELEGATE_DESKTOP_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
@@ skipping 29 matching lines @@
       int event_request_id);
 
   // ConfirmInfoBarDelegate overrides.
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
 
   bool Accept() override;
 
   // InfoBarDelegate override.
+  std::string GetIdentifier() const override;
   void InfoBarDismissed() override;
 
  protected:
   AppBannerInfoBarDelegateDesktop(
       scoped_refptr<AppBannerDataFetcherDesktop> fetcher,
       const content::Manifest& web_manifest,
       extensions::BookmarkAppHelper* bookmark_app_helper,
       int event_request_id);
 
  private:
   scoped_refptr<AppBannerDataFetcherDesktop> fetcher_;
   content::Manifest web_manifest_;
   extensions::BookmarkAppHelper* bookmark_app_helper_;
   int event_request_id_;
   bool has_user_interaction_;
 
   Type GetInfoBarType() const override;
   int GetIconId() const override;
   gfx::VectorIconId GetVectorIconId() const override;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerInfoBarDelegateDesktop);
 };
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_INFOBAR_DELEGATE_DESKTOP_H_