[Presentation API] Added the DefaultPresentationStart event and parsing of the default presentation…

Source/modules/presentation/DefaultSessionStartEvent.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/presentation/DefaultSessionStartEvent.h"
+
+#include "modules/presentation/DefaultSessionStartEventInit.h"
+
+namespace blink {
+
+DefaultSessionStartEvent::~DefaultSessionStartEvent()
+{
+}
+
+DefaultSessionStartEvent::DefaultSessionStartEvent()
+{
+}
+
+DefaultSessionStartEvent::DefaultSessionStartEvent(const AtomicString& eventType, PresentationSession* session)
+    : Event(eventType, false /* canBubble */, false /* cancelable */)
+    , m_session(session)
+{
+}
+
+DefaultSessionStartEvent::DefaultSessionStartEvent(const AtomicString& eventType, const DefaultSessionStartEventInit& initializer)
+    : Event(eventType, initializer)
+    , m_session(initializer.session())
+{
+}
+
+const AtomicString& DefaultSessionStartEvent::interfaceName() const
+{
+    return EventNames::DefaultSessionStartEvent;
+}
+
+} // namespace blink