Add IDL and initial Blink API for Background Sync

Source/modules/background_sync/SyncEvent.cpp

+// Copyright 2015 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.
+
+#include "config.h"
+#include "modules/background_sync/SyncEvent.h"
+
+namespace blink {
+
+SyncEvent::SyncEvent()
+{
+}
+
+SyncEvent::SyncEvent(const AtomicString& type, SyncRegistration* registration, WaitUntilObserver* observer)
+    : ExtendableEvent(type, ExtendableEventInit(), observer)
+    , m_registration(registration)
+{
+}
+
+SyncEvent::SyncEvent(const AtomicString& type, const SyncEventInit& init)
+    : ExtendableEvent(type, init)
+{
+    m_registration = init.registration();
+}
+
+SyncEvent::~SyncEvent()
+{
+}
+
+const AtomicString& SyncEvent::interfaceName() const
+{
+    return EventNames::SyncEvent;
+}
+
+SyncRegistration* SyncEvent::registration()
+{
+    return m_registration.get();
+}
+
+void SyncEvent::trace(Visitor* visitor)

[jkarlin, 2015/02/27 20:08:12]

DEFINE_TRACE(PushEvent)

[iclelland, 2015/03/02 03:51:11]

Done. (As SyncEvent ;) )

+{
+    visitor->trace(m_registration);
+    ExtendableEvent::trace(visitor);
+}
+
+} // namespace blink