blob: d2ae7164121def666f5dd6986eb8a0a71ccea506 [file] [log] [blame]
// Copyright 2018 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 "base/callback.h"
namespace content {
class WebContents;
} // namespace content
namespace resource_coordinator {
using HasBeforeUnloadHandlerCallback =
base::OnceCallback<void(bool has_before_unload_handler)>;
// Determines if the given WebContents has a beforeunload handler; if not, it is
// safe to discard. This works by calling WebContents::DispatchBeforeUnload with
// |auto_cancel = true|, which prevents a beforeunload dialog from being
// displayed to the user in the case that there is a beforeunload handler. This
// should only be called from the UI thread, and the callback will similarly
// be invoked from there.
void HasBeforeUnloadHandler(content::WebContents* contents,
HasBeforeUnloadHandlerCallback&& callback);
} // namespace resource_coordinator