Add method for identifying different InfoBars

chrome/browser/android/hung_renderer_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_ANDROID_HUNG_RENDERER_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_ANDROID_HUNG_RENDERER_INFOBAR_DELEGATE_H_
 
 #include "components/infobars/core/confirm_infobar_delegate.h"
 
 namespace content {
@@ skipping 29 matching lines @@
     RENDERER_BECAME_RESPONSIVE,
     TAB_CLOSED,
     EVENT_COUNT
   };
 
   explicit HungRendererInfoBarDelegate(
       content::RenderProcessHost* render_process_host);
   ~HungRendererInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  std::string GetIdentifier() const override;
   void InfoBarDismissed() override;
   HungRendererInfoBarDelegate* AsHungRendererInfoBarDelegate() override;
   int GetIconId() const override;
   base::string16 GetMessageText() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
 
   void LogEvent(Event event);
 
   // Used to terminate the renderer process if the user clicks the kill button.
   content::RenderProcessHost* render_process_host_;
 
   bool terminal_event_logged_for_uma_;
 
   DISALLOW_COPY_AND_ASSIGN(HungRendererInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_HUNG_RENDERER_INFOBAR_DELEGATE_H_