Introduce a //content/ API for dispatching notificationclick events.

content/public/browser/notification_event_dispatcher.h

Index: content/public/browser/notification_event_dispatcher.h
diff --git a/content/public/browser/notification_event_dispatcher.h b/content/public/browser/notification_event_dispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..aab77c559290a14c5d95eb076d66119b3bb9fac8
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+++ b/content/public/browser/notification_event_dispatcher.h
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+// 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_PUBLIC_BROWSER_NOTIFICATION_EVENT_DISPATCHER_H_
+#define CONTENT_PUBLIC_BROWSER_NOTIFICATION_EVENT_DISPATCHER_H_
+
+#include <string>
+
+#include "base/callback_forward.h"
+#include "content/common/content_export.h"
+#include "content/public/common/persistent_notification_status.h"
+
+class GURL;
+
+namespace content {
+
+class BrowserContext;
+struct ShowDesktopNotificationHostMsgParams;
+
+// This is the dispatcher to be used for firing events related to persistent
+// notifications on a Service Worker. This class is a singleton, the instance of
+// which can be retrieved using the static GetInstance() method. All methods
+// must be called on the UI thread.
+class CONTENT_EXPORT NotificationEventDispatcher {
+ public:
+  CONTENT_EXPORT static NotificationEventDispatcher* GetInstance();
+
+  using NotificationClickDispatchCompleteCallback =
+      base::Callback<void(PersistentNotificationStatus)>;
+
+  // Dispatches the "notificationclick" event on the Service Worker associated
+  // with |origin| and |service_worker_registration_id|. The |callback| will
+  // be invoked when it's known whether the event successfully executed.
+  virtual void DispatchNotificationClickEvent(
+      BrowserContext* browser_context,
+      const GURL& origin,
+      int64 service_worker_registration_id,
+      const std::string& notification_id,
+      const ShowDesktopNotificationHostMsgParams& notification_data,
+      const NotificationClickDispatchCompleteCallback&
+          dispatch_complete_callback) = 0;
+
+ protected:
+  virtual ~NotificationEventDispatcher() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_NOTIFICATION_EVENT_DISPATCHER_H_