Log Autofill.Quality.*.ByFieldType by predicted type for unknown data.

components/autofill/core/browser/autofill_type.cc

Index: components/autofill/core/browser/autofill_type.cc
diff --git a/components/autofill/core/browser/autofill_type.cc b/components/autofill/core/browser/autofill_type.cc
index 2b97a2f6eda7863a3257779342ba9d3134aa8d52..b58d1a131ba1181b9df3f6708903de81aa7af0db 100644
--- a/components/autofill/core/browser/autofill_type.cc
+++ b/components/autofill/core/browser/autofill_type.cc
@@ -131,6 +131,7 @@ FieldTypeGroup AutofillType::group() const {
 
     case NO_SERVER_DATA:
     case EMPTY_TYPE:
+    case AMBIGUOUS_TYPE:
     case PHONE_FAX_NUMBER:
     case PHONE_FAX_CITY_CODE:
     case PHONE_FAX_COUNTRY_CODE:
@@ -771,6 +772,9 @@ std::string AutofillType::ServerFieldTypeToString(ServerFieldType type) {
     case CONFIRMATION_PASSWORD:
       return "CONFIRMATION_PASSWORD";
 
+    case AMBIGUOUS_TYPE:
+      return "AMBIGUOUS_TYPE";
+
     case MAX_VALID_FIELD_TYPE:
       return std::string();
   }