AutofillSaveCardInfoBar on mobile should not appear when legal messages don't parse correctly

components/autofill/core/browser/autofill_metrics.h

Index: components/autofill/core/browser/autofill_metrics.h
diff --git a/components/autofill/core/browser/autofill_metrics.h b/components/autofill/core/browser/autofill_metrics.h
index d849ce143f8bce195815706ee4ac48778b4ad44e..d96e904668add0ec22770d0131df67a8e3d80b20 100644
--- a/components/autofill/core/browser/autofill_metrics.h
+++ b/components/autofill/core/browser/autofill_metrics.h
@@ -283,6 +283,9 @@ class AutofillMetrics {
     INFOBAR_DENIED,     // The user explicitly denied the infobar.
     INFOBAR_IGNORED,    // The user completely ignored the infobar (logged on
                         // tab close).
+    INFOBAR_NOT_SHOWN_INVALID_LEGAL_MESSAGE,  // We didn't show the infobar
+                                              // because the provided legal
+                                              // message was invalid.
     NUM_INFO_BAR_METRICS,
   };