Introduce the PushSubscription.curve25519dh attribute (3/3)

Source/modules/push_messaging/PushSubscription.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 PushSubscription_h
 #define PushSubscription_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/DOMArrayBuffer.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ServiceWorkerRegistration;
 class ScriptPromiseResolver;
 class ScriptState;
 struct WebPushSubscription;
 
 class PushSubscription final : public GarbageCollectedFinalized<PushSubscription>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PushSubscription* take(ScriptPromiseResolver*, WebPushSubscription*, ServiceWorkerRegistration*);
     static void dispose(WebPushSubscription* subscriptionRaw);
 
     virtual ~PushSubscription();
 
     KURL endpoint() const;
+    PassRefPtr<DOMArrayBuffer> curve25519dh() const;
+
     ScriptPromise unsubscribe(ScriptState*);
 
     ScriptValue toJSONForBinding(ScriptState*);
 
     DECLARE_TRACE();
 
 private:
-    PushSubscription(const KURL& endpoint, ServiceWorkerRegistration*);
+    PushSubscription(const WebPushSubscription&, ServiceWorkerRegistration*);
 
     KURL m_endpoint;
+    RefPtr<DOMArrayBuffer> m_curve25519dh;
+
     Member<ServiceWorkerRegistration> m_serviceWorkerRegistration;
 };
 
 } // namespace blink
 
 #endif // PushSubscription_h