MacViews: support Views credit card unmask prompt

chrome/browser/ui/views/autofill/card_unmask_prompt_views_shim.cc

Index: chrome/browser/ui/views/autofill/card_unmask_prompt_views_shim.cc
diff --git a/chrome/browser/ui/views/autofill/card_unmask_prompt_views_shim.cc b/chrome/browser/ui/views/autofill/card_unmask_prompt_views_shim.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f463b32d09abd2e904d68838a4db02152eb4401f
--- /dev/null
+++ b/chrome/browser/ui/views/autofill/card_unmask_prompt_views_shim.cc
@@ -0,0 +1,15 @@
+// Copyright 2016 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.
+
+#include "chrome/browser/ui/views/autofill/card_unmask_prompt_views.h"
+
+namespace autofill {
+
+CardUnmaskPromptView* CreateCardUnmaskPromptView(
+    CardUnmaskPromptController* controller,
+    content::WebContents* web_contents) {
+  return new CardUnmaskPromptViews(controller, web_contents);

[Evan Stade, 2016/05/24 18:01:48]

imo adding a whole new file for this, especially because the gypi file needs to
explicitly exclude it on mac, is not worth it. Why not just #if
!defined(OS_MACOSX) in place?

[Elly Fong-Jones, 2016/05/24 18:08:53]

OS_MACOSX is true in mac_views_browser==1 builds, which need to use the full
Views stack and no Cocoa code. This file is included in mac_views_browser==1
builds but not Cocoa builds.

+}
+
+}