Add "Sign In" button to the account chooser on Mac.

chrome/browser/ui/passwords/password_dialog_controller_mock.cc

Index: chrome/browser/ui/passwords/password_dialog_controller_mock.cc
diff --git a/chrome/browser/ui/passwords/password_dialog_controller_mock.cc b/chrome/browser/ui/passwords/password_dialog_controller_mock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9f34a914c33da99982de62c0b0df2a1e8eecf227
--- /dev/null
+++ b/chrome/browser/ui/passwords/password_dialog_controller_mock.cc
@@ -0,0 +1,11 @@
+// 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/passwords/password_dialog_controller_mock.h"
+
+#include "components/autofill/core/common/password_form.h"
+
+PasswordDialogControllerMock::PasswordDialogControllerMock() {}
+
+PasswordDialogControllerMock::~PasswordDialogControllerMock() {}