Experiment to add bank name in autofill ui.

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..9d8ea6a05ec0c03ff273c30b0d61c67ebae74259 100644
--- a/components/autofill/core/browser/autofill_metrics.h
+++ b/components/autofill/core/browser/autofill_metrics.h
@@ -542,7 +542,11 @@ class AutofillMetrics {
     // submitted. If the submission is not interrupted by JavaScript, the "form
     // submitted" event above will also be logged.
     FORM_EVENT_SUGGESTION_SHOWN_WILL_SUBMIT_ONCE,
-
+    // A dropdown with suggestions was shown and suggestions have bank names.
+    FORM_EVENT_SUGGESTIONS_SHOWN_WITH_BANK_NAME_AVAILABLE_ONCE,

[sebsg, 2017/06/12 21:17:00]

Since it's for an experiment, I would prefer the metric to be logged on its own
please.

[Shanfeng, 2017/06/12 23:34:58]

Do you mean create a new FormEvent like:
enum BankNameFormEvent {
  FORM_EVENT_SUGGESTIONS_SHOWN_WITH_BANK_NAME_AVAILABLE_ONCE,
  FORM_EVENT_SERVER_SUGGESTION_FILLED_WITH_BANK_NAME_AVAILABLE_ONCE,
};
?

[sebsg, 2017/06/13 13:36:04]

yep I'd prefer that :)

+    // A server suggestion was used to fill the form and suggestions have bank
+    // names.
+    FORM_EVENT_SERVER_SUGGESTION_FILLED_WITH_BANK_NAME_AVAILABLE_ONCE,
     NUM_FORM_EVENTS,
   };
 
@@ -937,6 +941,7 @@ class AutofillMetrics {
 
     void OnFormSubmitted();
 
+    void SetBankNameAvailable();
    private:
     void Log(FormEvent event) const;
 
@@ -950,6 +955,7 @@ class AutofillMetrics {
     bool has_logged_suggestion_filled_;
     bool has_logged_will_submit_;
     bool has_logged_submitted_;
+    bool has_logged_bank_name_available_;
     bool logged_suggestion_filled_was_server_data_;
     bool logged_suggestion_filled_was_masked_server_card_;