[Autofill] Re-introduce some debug logs for Autofill queries.

components/autofill/core/browser/form_structure.cc

Index: components/autofill/core/browser/form_structure.cc
diff --git a/components/autofill/core/browser/form_structure.cc b/components/autofill/core/browser/form_structure.cc
index a58c1c8b67c13c4def44dc584633b0419863bd3a..73aeb1a6b95ca779ba62df604c7afb57efd9d10f 100644
--- a/components/autofill/core/browser/form_structure.cc
+++ b/components/autofill/core/browser/form_structure.cc
@@ -272,6 +272,16 @@ std::string StripDigitsIfRequired(const base::string16& input) {
   return return_string;
 }
 
+std::ostream& operator<<(
+    std::ostream& out,
+    const autofill::AutofillQueryResponseContents& response) {
+  out << "upload_required: " << response.upload_required();
+  for (const auto& field : response.field()) {
+    out << "\nautofill_type: " << field.autofill_type();
+  }
+  return out;
+}
+
 }  // namespace
 
 FormStructure::FormStructure(const FormData& form)
@@ -433,6 +443,8 @@ void FormStructure::ParseQueryResponse(std::string payload,
   if (!response.ParseFromString(payload))
     return;
 
+  VLOG(1) << "Autofill query response was successfully parsed:\n" << response;
+
   AutofillMetrics::LogServerQueryMetric(AutofillMetrics::QUERY_RESPONSE_PARSED);
 
   bool heuristics_detected_fillable_field = false;