Add FromInfobarDelegate API to AutofillSaveCardInfoBarDelegateMobile

Bug: 1071914
Change-Id: Ieb1c78e1c6a771672c84ae7011ad7bf4815655c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2236597
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#776355}

components/autofill/core/browser/payments/autofill_save_card_infobar_delegate_mobile.cc

@@ -72,6 +72,15 @@ AutofillSaveCardInfoBarDelegateMobile::
   }
 }
 
+// static
+AutofillSaveCardInfoBarDelegateMobile*
+AutofillSaveCardInfoBarDelegateMobile::FromInfobarDelegate(
+    infobars::InfoBarDelegate* delegate) {
+  return delegate->GetIdentifier() == AUTOFILL_CC_INFOBAR_DELEGATE_MOBILE
+             ? static_cast<AutofillSaveCardInfoBarDelegateMobile*>(delegate)
+             : nullptr;
+}
+
 void AutofillSaveCardInfoBarDelegateMobile::OnLegalMessageLinkClicked(
     GURL url) {
   infobar()->owner()->OpenURL(url, WindowOpenDisposition::NEW_FOREGROUND_TAB);

components/autofill/core/browser/payments/autofill_save_card_infobar_delegate_mobile.h

@@ -39,6 +39,11 @@ class AutofillSaveCardInfoBarDelegateMobile : public ConfirmInfoBarDelegate {
 
   ~AutofillSaveCardInfoBarDelegateMobile() override;
 
+  // Returns |delegate| as an AutofillSaveCardInfoBarDelegateMobile, or nullptr
+  // if it is of another type.
+  static AutofillSaveCardInfoBarDelegateMobile* FromInfobarDelegate(
+      infobars::InfoBarDelegate* delegate);
+
   bool upload() const { return upload_; }
   int issuer_icon_id() const { return issuer_icon_id_; }
   const base::string16& card_label() const { return card_label_; }