Refactor Web Notification permission requests.

content/renderer/notification_permission_dispatcher.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_RENDERER_NOTIFICATION_PERMISSION_DISPATCHER_H_
+#define CONTENT_RENDERER_NOTIFICATION_PERMISSION_DISPATCHER_H_
+
+#include "base/id_map.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "ipc/ipc_message.h"
+#include "third_party/WebKit/public/platform/WebNotificationPermission.h"
+
+namespace blink {
+class WebNotificationPermissionCallback;
+class WebSecurityOrigin;
+}
+
+namespace content {
+
+// Dispatcher for Web Notification permission requests.
+class NotificationPermissionDispatcher : public RenderFrameObserver {
+ public:
+  explicit NotificationPermissionDispatcher(RenderFrame* render_frame);
+  virtual ~NotificationPermissionDispatcher();
+
+  // Requests permission to display Web Notifications for |origin|. The callback
+  // will be invoked when the permission status is available. This class will
+  // take ownership of |callback|.
+  void RequestPermission(
+      const blink::WebSecurityOrigin& origin,
+      blink::WebNotificationPermissionCallback* callback);
+
+ private:
+  // RenderFrameObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void OnPermissionRequestComplete(
+      int request_id, blink::WebNotificationPermission result);
+
+  // Tracks the active notification permission requests. This class takes
+  // ownership of the created WebNotificationPermissionCallback objects.
+  IDMap<blink::WebNotificationPermissionCallback, IDMapOwnPointer>
+      pending_requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationPermissionDispatcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_NOTIFICATION_PERMISSION_DISPATCHER_H_