[Extensions] Introduce a ScopedExtensionDialogAutoConfirm

extensions/browser/extension_dialog_auto_confirm.h

+// 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 EXTENSIONS_BROWSER_EXTENSION_DIALOG_AUTO_CONFIRM_H_
+#define EXTENSIONS_BROWSER_EXTENSION_DIALOG_AUTO_CONFIRM_H_
+
+#include "base/auto_reset.h"
+
+namespace extensions {
+
+// An enum used in for settings to cause dialogs to auto-confirm or cancel
+// during testing.
+enum ExtensionDialogAutoConfirm {
+  AUTO_CONFIRM_NONE,    // The prompt will show normally.
+  AUTO_CONFIRM_ACCEPT,  // The prompt will always accept.
+  AUTO_CONFIRM_CANCEL,  // The prompt will always cancel.
+};
+
+using ScopedExtensionDialogAutoConfirm =

[not at google - send to devlin, 2015/05/30 01:13:28]

it seems like the "Extension" (and above) at least is a tautology, and you can
leave it out. A little less verbose.

+    base::AutoReset<ExtensionDialogAutoConfirm>;
+
+// Please use the above ScopedExtensionDialogAutoConfirm with these.
+// It'd be nice if these could go in their corresponding classes, but the
+// layering violation is enough of a pain that it's not worth it.
+extern ExtensionDialogAutoConfirm g_auto_confirm_uninstall_for_testing;
+extern ExtensionDialogAutoConfirm g_auto_confirm_install_for_testing;

[not at google - send to devlin, 2015/05/30 01:13:28]

I don't find the callsites of these particularly attractive;
ScopedDialogAutoConfirm(&g_auto_confirm_uninstall_for_testing, foo) would read
better as ScopedDialogAutoConfirmUninstall.

Then again, maybe I'd just have a single autoconfirm flag rather than trying to
separate install vs uninstall. In theory this is just going to grow if you need
to add other autoconfirm types (permission upgrade?) and I don't think the
distinction is that interesting. Especially even given that "uninstall" covers
two completely different code paths for uninstall.

I'd go with just "ScopedAutoConfirmDialogForTest" and
"IsAutoConfirmDialogForTest"?

+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_EXTENSION_DIALOG_AUTO_CONFIRM_H_