[Autofill] Add UMA timing metrics for requestAutocomplete dialog.

chrome/browser/ui/autofill/autofill_dialog_view.h

Index: chrome/browser/ui/autofill/autofill_dialog_view.h
diff --git a/chrome/browser/ui/autofill/autofill_dialog_view.h b/chrome/browser/ui/autofill/autofill_dialog_view.h
index 8dcea71d9bc4c607f4f3d1bc302c359a09922760..e01046a3af53cb3ed72ee6455df1d70c275a34eb 100644
--- a/chrome/browser/ui/autofill/autofill_dialog_view.h
+++ b/chrome/browser/ui/autofill/autofill_dialog_view.h
@@ -63,6 +63,12 @@ class AutofillDialogView {
   // Called when the active suggestions data model changed.
   virtual void ModelChanged() = 0;
 
+  // Simulates the user pressing 'Submit' to accept the dialog.
+  virtual void SubmitForTesting() = 0;
+
+  // Simulates the user pressing 'Cancel' to abort the dialog.
+  virtual void CancelForTesting() = 0;
+
   // Factory function to create the dialog (implemented once per view
   // implementation). |controller| will own the created dialog.
   static AutofillDialogView* Create(AutofillDialogController* controller);