Implement a RenderFrame-less path for Web Notifications.

content/browser/notification_message_filter.h

+// Copyright 2014 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 CONTENT_BROWSER_NOTIFICATION_MESSAGE_FILTER_H_
+#define CONTENT_BROWSER_NOTIFICATION_MESSAGE_FILTER_H_
+
+#include "content/public/browser/browser_message_filter.h"
+#include "third_party/WebKit/public/platform/WebNotificationPermission.h"
+
+class GURL;
+
+namespace content {
+
+class ResourceContext;
+struct ShowDesktopNotificationHostMsgParams;
+
+class NotificationMessageFilter : public BrowserMessageFilter {
+ public:
+  NotificationMessageFilter(
+      int process_id,
+      ResourceContext* resource_context);
+
+  // BrowserMessageFilter implementation. Called on the UI thread.
+  bool OnMessageReceived(const IPC::Message& message) override;
+  void OverrideThreadForMessage(
+      const IPC::Message& message, content::BrowserThread::ID* thread) override;
+
+ protected:
+  ~NotificationMessageFilter() override;
+
+ private:
+  void OnCheckNotificationPermission(
+    const GURL& origin, blink::WebNotificationPermission* permission);
+  void OnShowPlatformNotification(
+    int notification_id, const ShowDesktopNotificationHostMsgParams& params);
+  void OnClosePlatformNotification(int notification_id);
+
+  int process_id_;
+  ResourceContext* resource_context_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_NOTIFICATION_MESSAGE_FILTER_H_