Revert of Remove content::NotificationPermissionDispatcher.

third_party/WebKit/Source/modules/notifications/NotificationPermissionClient.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 NotificationPermissionClient_h
+#define NotificationPermissionClient_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "modules/ModulesExport.h"
+#include "platform/Supplementable.h"
+
+namespace blink {
+
+class ExecutionContext;
+class LocalFrame;
+class NotificationPermissionCallback;
+class ScriptState;
+
+class NotificationPermissionClient : public Supplement<LocalFrame> {
+public:
+    virtual ~NotificationPermissionClient() { }
+
+    // Requests user permission to show platform notifications from the origin of the
+    // current frame. The provided callback will be ran when the user has made a decision.
+    virtual ScriptPromise requestPermission(ScriptState*, NotificationPermissionCallback*) = 0;
+
+    // Supplement requirements.
+    static const char* supplementName();
+    static NotificationPermissionClient* from(ExecutionContext*);
+};
+
+MODULES_EXPORT void provideNotificationPermissionClientTo(LocalFrame&, NotificationPermissionClient*);
+
+} // namespace blink
+
+#endif // NotificationPermissionClient_h