Add method for identifying different InfoBars

components/infobars/core/simple_alert_infobar_delegate.h

Index: components/infobars/core/simple_alert_infobar_delegate.h
diff --git a/components/infobars/core/simple_alert_infobar_delegate.h b/components/infobars/core/simple_alert_infobar_delegate.h
index f2cd45458e280d11708112bdd1ccfc309925ff22..eafc209bb35553ab7e19acc297dfb5f807efa055 100644
--- a/components/infobars/core/simple_alert_infobar_delegate.h
+++ b/components/infobars/core/simple_alert_infobar_delegate.h
@@ -20,26 +20,31 @@ class SimpleAlertInfoBarDelegate : public ConfirmInfoBarDelegate {
   // Creates a simple alert infobar and delegate and adds the infobar to
   // |infobar_manager|. If |vector_icon_id| is not VECTOR_ICON_NONE, it will be
   // shown; otherwise, |icon_id| (if present) will be used as the icon.
+  // |infobar_identifier| names what class triggered the infobar for metrics.
   static void Create(infobars::InfoBarManager* infobar_manager,
+                     const std::string& infobar_identifier,
                      int icon_id,
                      gfx::VectorIconId vector_icon_id,
                      const base::string16& message,
                      bool auto_expire);
 
  private:
-  SimpleAlertInfoBarDelegate(int icon_id,
+  SimpleAlertInfoBarDelegate(const std::string& infobar_identifier,
+                             int icon_id,
                              gfx::VectorIconId vector_icon_id,
                              const base::string16& message,
                              bool auto_expire);
   ~SimpleAlertInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  std::string GetIdentifier() const override;
   int GetIconId() const override;
   gfx::VectorIconId GetVectorIconId() const override;
   bool ShouldExpire(const NavigationDetails& details) const override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
 
+  const std::string infobar_identifier_;
   const int icon_id_;
   gfx::VectorIconId vector_icon_id_;
   base::string16 message_;