[Autofill] Add UMA timing metrics for requestAutocomplete dialog.

chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc

Index: chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc
diff --git a/chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc b/chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc
index 123704ec7aba365ae787d035aad3804121a4b06e..0f2253288f21ee0054626efae8b9ff071dcc2ab8 100644
--- a/chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc
+++ b/chrome/browser/ui/autofill/autofill_dialog_controller_impl.cc
@@ -125,6 +125,8 @@ AutofillDialogControllerImpl::AutofillDialogControllerImpl(
     const FormData& form,
     const GURL& source_url,
     const content::SSLStatus& ssl_status,
+    const AutofillMetrics& metric_logger,
+    DialogRequester requester,
     const base::Callback<void(const FormStructure*)>& callback)
     : profile_(Profile::FromBrowserContext(contents->GetBrowserContext())),
       contents_(contents),
@@ -138,7 +140,10 @@ AutofillDialogControllerImpl::AutofillDialogControllerImpl(
       ALLOW_THIS_IN_INITIALIZER_LIST(suggested_billing_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(suggested_shipping_(this)),
       popup_controller_(NULL),
-      section_showing_popup_(SECTION_BILLING) {
+      section_showing_popup_(SECTION_BILLING),
+      dialog_shown_timestamp_(base::Time::Now()),
+      metric_logger_(metric_logger),
+      requester_(requester) {
   // TODO(estade): |this| should observe PersonalDataManager.
   // TODO(estade): remove duplicates from |form|?
 
@@ -527,6 +532,13 @@ void AutofillDialogControllerImpl::ViewClosed(DialogAction action) {
     callback_.Run(NULL);
   }
 
+  AutofillMetrics::DialogDismissalAction metric =
+      action == ACTION_SUBMIT ?
+          AutofillMetrics::DIALOG_ACCEPTED :
+          AutofillMetrics::DIALOG_CANCELED;
+  metric_logger_.LogRequestAutocompleteUiDuration(
+      base::Time::Now() - dialog_shown_timestamp_, requester_, metric);
+
   delete this;
 }