[Autofill] UKM for suggestions polled field.

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 61d7f85e60b1bda2204ebb5fa6cd69745b4dfc5b..87dc575aa1497ca54ca5e6f3136a3231cd7b0c6b 100644
--- a/components/autofill/core/browser/autofill_metrics.h
+++ b/components/autofill/core/browser/autofill_metrics.h
@@ -38,6 +38,9 @@ extern const char kUKMServerRecordTypeCountMetricName[];
 
 // |UkmEntry| when we show suggestions.

[csashi, 2017/05/25 08:40:33]

and when user edits text field. See |kUkmTextFieldDidChangeEntryName|.

[jiahuiguo, 2017/05/25 19:02:35]

Done.

 extern const char kUKMSuggestionsShownEntryName[];
+extern const char kUKMHeuristicTypeMetricName[];
+extern const char kUKMHtmlFieldTypeMetricName[];
+extern const char kUKMServerTypeMetricName[];
 
 // |UkmEntry| when user selects a masked server credit card.
 extern const char kUKMSelectedMaskedServerCardEntryName[];
@@ -57,9 +60,6 @@ extern const char kUKMRecordTypeMetricName[];
 // |UkmEntry| for user editing text field. Metrics contain field's attributes.
 extern const char kUKMTextFieldDidChangeEntryName[];
 extern const char kUKMFieldTypeGroupMetricName[];
-extern const char kUKMHeuristicTypeMetricName[];
-extern const char kUKMServerTypeMetricName[];
-extern const char kUKMHtmlFieldTypeMetricName[];
 extern const char kUKMHtmlFieldModeMetricName[];
 extern const char kUKMIsAutofilledMetricName[];
 extern const char kUKMIsEmptyMetricName[];
@@ -629,7 +629,7 @@ class AutofillMetrics {
     void LogInteractedWithForm(bool is_for_credit_card,
                                size_t local_record_type_count,
                                size_t server_record_type_count);
-    void LogSuggestionsShown();
+    void LogSuggestionsShown(const AutofillField& field);
     void LogSelectedMaskedServerCard();
     void LogDidFillSuggestion(int record_type);
     void LogTextFieldDidChange(const AutofillField& field);
@@ -859,7 +859,7 @@ class AutofillMetrics {
 
     void OnDidPollSuggestions(const FormFieldData& field);
 
-    void OnDidShowSuggestions();
+    void OnDidShowSuggestions(const AutofillField& field);
 
     void OnDidSelectMaskedServerCardSuggestion();