Add a regression test for the CardUnmaskPrompt.

chrome/browser/ui/views/autofill/card_unmask_prompt_view_tester_views.h

Index: chrome/browser/ui/views/autofill/card_unmask_prompt_view_tester_views.h
diff --git a/chrome/browser/ui/views/autofill/card_unmask_prompt_view_tester_views.h b/chrome/browser/ui/views/autofill/card_unmask_prompt_view_tester_views.h
new file mode 100644
index 0000000000000000000000000000000000000000..e69baac722956983f762baf71b26a044a7aee5a3
--- /dev/null
+++ b/chrome/browser/ui/views/autofill/card_unmask_prompt_view_tester_views.h
@@ -0,0 +1,30 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_AUTOFILL_CARD_UNMASK_PROMPT_VIEW_TESTER_VIEWS_H_
+#define CHROME_BROWSER_UI_VIEWS_AUTOFILL_CARD_UNMASK_PROMPT_VIEW_TESTER_VIEWS_H_
+
+#include "chrome/browser/ui/autofill/card_unmask_prompt_view_tester.h"
+
+namespace autofill {
+
+class CardUnmaskPromptViews;
+
+// Class that facilitates testing a CardUnmaskPromptViews.
+class CardUnmaskPromptViewTesterViews : public CardUnmaskPromptViewTester {
+ public:
+  explicit CardUnmaskPromptViewTesterViews(CardUnmaskPromptViews* view);
+  ~CardUnmaskPromptViewTesterViews() override;
+
+  void Close() override;
+
+ private:
+  CardUnmaskPromptViews* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(CardUnmaskPromptViewTesterViews);
+};
+
+}  // namespace autofill
+
+#endif  // CHROME_BROWSER_UI_VIEWS_AUTOFILL_CARD_UNMASK_PROMPT_VIEW_TESTER_VIEWS_H_