[Autofill] Add UMA timing metrics for requestAutocomplete dialog.

chrome/browser/autofill/autofill_manager.cc

Index: chrome/browser/autofill/autofill_manager.cc
diff --git a/chrome/browser/autofill/autofill_manager.cc b/chrome/browser/autofill/autofill_manager.cc
index cbdcbaeebac3d6b3665bac8317807aed8cf77841..e01592a0b8a9d894a68dca361968879caf6ded0c 100644
--- a/chrome/browser/autofill/autofill_manager.cc
+++ b/chrome/browser/autofill/autofill_manager.cc
@@ -582,7 +582,7 @@ void AutofillManager::OnQueryFormFieldAutofill(int query_id,
     // Autofill server said so), then trigger payments UI while also returning
     // standard autofill suggestions to renderer process.
     if (page_meta_data_.IsStartOfAutofillableFlow()) {
-      AutocheckoutInfoBarDelegate::Create(
+      autofill::AutocheckoutInfoBarDelegate::Create(
           *metric_logger_,
           form.origin,
           form.ssl_status,
@@ -787,9 +787,10 @@ void AutofillManager::ShowRequestAutocompleteDialog(
     const FormData& form,
     const GURL& source_url,
     const content::SSLStatus& ssl_status,
+    autofill::DialogRequester requester,
     const base::Callback<void(const FormStructure*)>& callback) {
   manager_delegate_->ShowRequestAutocompleteDialog(
-      form, source_url, ssl_status, callback);
+      form, source_url, ssl_status, *metric_logger_, requester, callback);
 }
 
 void AutofillManager::RequestAutocompleteDialogClosed() {
@@ -840,7 +841,9 @@ void AutofillManager::OnRequestAutocomplete(
 
   base::Callback<void(const FormStructure*)> callback =
       base::Bind(&AutofillManager::ReturnAutocompleteData, this);
-  ShowRequestAutocompleteDialog(form, frame_url, ssl_status, callback);
+  ShowRequestAutocompleteDialog(
+      form, frame_url, ssl_status,
+      autofill::DIALOG_REQUESTER_REQUEST_AUTOCOMPLETE, callback);
 }
 
 void AutofillManager::ReturnAutocompleteResult(