[Presentation API] make PresentationReceiver API consistent with latest spec

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

Index: third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp b/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8265b21a7a12807ea206f931361c4a1488b7cae3
--- /dev/null
+++ b/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
@@ -0,0 +1,44 @@
+// Copyright 2016 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 "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)
+    : m_frame(frame)
+{
+}
+
+const AtomicString& PresentationConnectionList::interfaceName() const
+{
+    return EventTargetNames::PresentationConnectionList;
+}
+
+ExecutionContext* PresentationConnectionList::getExecutionContext() const
+{
+    return m_frame ? m_frame->document() : nullptr;

[mark a. foltz, 2016/08/23 19:08:49]

I note that PresentationConnection also allows a nullptr ExecutionContext to be
returned, but that would seem to trigger crashes when the connection is
manipulated.

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