Add a regression test for the CardUnmaskPrompt.

chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.h

Index: chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.h
diff --git a/chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.h b/chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.h
index 435bcaa57d91970c306f402899600f88f7507ab7..4b67642463402c6e82575480f8888d03ca4e9554 100644
--- a/chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.h
+++ b/chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.h
@@ -43,19 +43,20 @@ class CardUnmaskPromptControllerImpl : public CardUnmaskPromptController {
   bool InputCvcIsValid(const base::string16& input_text) const override;
   bool InputExpirationIsValid(const base::string16& month,
                               const base::string16& year) const override;
+  base::TimeDelta GetSuccessMessageDuration() const override;
 
  protected:
   // Virtual so tests can suppress it.
   virtual CardUnmaskPromptView* CreateAndShowView();
   virtual void LoadRiskFingerprint();
 
-  virtual void OnDidLoadRiskFingerprint(const std::string& risk_data);
+  // Protected so tests can call it.
+  void OnDidLoadRiskFingerprint(const std::string& risk_data);
 
   // Exposed for testing.
   CardUnmaskPromptView* view() { return card_unmask_view_; }
 
  private:
-
   bool AllowsRetry(AutofillClient::GetRealPanResult result);
   void LogOnCloseEvents();