[Presentation API] (4th)(1-UA blink side) Add WebPresentationConnection and WebPresentationConnecti…

third_party/WebKit/Source/modules/presentation/PresentationReceiver.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 "modules/presentation/PresentationReceiver.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
@@ skipping 21 matching lines @@
                                    ConnectionListProperty::Ready);
 
   if (!m_connectionList->isEmpty() &&
       m_connectionListProperty->getState() ==
           ScriptPromisePropertyBase::Pending)
     m_connectionListProperty->resolve(m_connectionList);
 
   return m_connectionListProperty->promise(scriptState->world());
 }
 
-void PresentationReceiver::onReceiverConnectionAvailable(
+WebPresentationConnection* PresentationReceiver::onReceiverConnectionAvailable(
     const WebPresentationSessionInfo& sessionInfo) {
   // take() will call PresentationReceiver::registerConnection()
   // and register the connection.
   auto connection = PresentationConnection::take(this, sessionInfo);
 
   // receiver.connectionList property not accessed
   if (!m_connectionListProperty)
-    return;
+    return nullptr;
 
   if (m_connectionListProperty->getState() ==
       ScriptPromisePropertyBase::Pending)
     m_connectionListProperty->resolve(m_connectionList);
   else if (m_connectionListProperty->getState() ==
            ScriptPromisePropertyBase::Resolved)
     m_connectionList->dispatchConnectionAvailableEvent(connection);
+
+  return connection;
 }
 
 void PresentationReceiver::registerConnection(
     PresentationConnection* connection) {
   DCHECK(m_connectionList);
   m_connectionList->addConnection(connection);
 }
 
 DEFINE_TRACE(PresentationReceiver) {
   visitor->trace(m_connectionList);
   visitor->trace(m_connectionListProperty);
   ContextClient::trace(visitor);
 }
 
 }  // namespace blink