Introduce the PushSubscription.curve25519dh attribute (3/3)

Source/modules/push_messaging/PushSubscription.cpp

Index: Source/modules/push_messaging/PushSubscription.cpp
diff --git a/Source/modules/push_messaging/PushSubscription.cpp b/Source/modules/push_messaging/PushSubscription.cpp
index e006eeaa4591de35bd57d46cbb36c09ea41362a5..cee79a21a6e1f1dc9b2a0b8b8c803267820114d1 100644
--- a/Source/modules/push_messaging/PushSubscription.cpp
+++ b/Source/modules/push_messaging/PushSubscription.cpp
@@ -20,7 +20,7 @@ namespace blink {
 PushSubscription* PushSubscription::take(ScriptPromiseResolver*, WebPushSubscription* pushSubscription, ServiceWorkerRegistration* serviceWorkerRegistration)
 {
     OwnPtr<WebPushSubscription> subscription = adoptPtr(pushSubscription);
-    return new PushSubscription(subscription->endpoint, serviceWorkerRegistration);
+    return new PushSubscription(*subscription, serviceWorkerRegistration);
 }
 
 void PushSubscription::dispose(WebPushSubscription* pushSubscription)
@@ -29,8 +29,9 @@ void PushSubscription::dispose(WebPushSubscription* pushSubscription)
         delete pushSubscription;
 }
 
-PushSubscription::PushSubscription(const KURL& endpoint, ServiceWorkerRegistration* serviceWorkerRegistration)
-    : m_endpoint(endpoint)
+PushSubscription::PushSubscription(const WebPushSubscription& subscription, ServiceWorkerRegistration* serviceWorkerRegistration)
+    : m_endpoint(subscription.endpoint)
+    , m_curve25519dh(DOMArrayBuffer::create(subscription.curve25519dh.data(), subscription.curve25519dh.size()))
     , m_serviceWorkerRegistration(serviceWorkerRegistration)
 {
 }
@@ -44,6 +45,11 @@ KURL PushSubscription::endpoint() const
     return m_endpoint;
 }
 
+PassRefPtr<DOMArrayBuffer> PushSubscription::curve25519dh() const
+{
+    return m_curve25519dh;
+}
+
 ScriptPromise PushSubscription::unsubscribe(ScriptState* scriptState)
 {
     RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
@@ -61,6 +67,9 @@ ScriptValue PushSubscription::toJSONForBinding(ScriptState* scriptState)
     V8ObjectBuilder result(scriptState);
     result.addString("endpoint", endpoint());
 
+    // TODO(peter): Include |curve25519dh| in the serialized JSON blob if the intended
+    // serialization behavior gets defined in the spec.
+
     return result.scriptValue();
 }