[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 b395f5498d67104b4ec1a8badeb5f1f953a73461..d9ddbf0f148bda80d76dd06329929865ededf89c 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,
@@ -795,9 +795,10 @@ 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() {
@@ -848,7 +849,9 @@ 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(