[Presentation API] make PresentationReceiver API consistent with latest spec

third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.

[haraken, 2016/08/23 00:03:48]

2016

[zhaobin, 2016/08/23 00:45:51]

Done.

[zhaobin, 2016/08/23 00:45:51]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/presentation/PresentationConnectionList.h"
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/events/Event.h"
+#include "core/frame/LocalFrame.h"
+#include "modules/EventTargetModules.h"
+
+namespace blink {
+
+PresentationConnectionList::PresentationConnectionList(LocalFrame* frame)
+    : DOMWindowProperty(frame)
+{
+}
+
+const AtomicString& PresentationConnectionList::interfaceName() const
+{
+    return EventTargetNames::PresentationConnectionList;
+}
+
+ExecutionContext* PresentationConnectionList::getExecutionContext() const
+{
+    return nullptr;

[haraken, 2016/08/23 00:03:48]

We shouldn't return nullptr from getExecutionContext().

[zhaobin, 2016/08/23 00:45:51]

Done.

+}
+
+const HeapVector<Member<PresentationConnection>>& PresentationConnectionList::connections() const
+{
+    return m_connections;
+}
+
+DEFINE_TRACE(PresentationConnectionList)
+{
+    visitor->trace(m_connections);
+    EventTargetWithInlineData::trace(visitor);
+    DOMWindowProperty::trace(visitor);
+}
+
+} // namespace blink