[Presentation API] Add layout test for connection.close() and fix test failures

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

Index: third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp b/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
index 142918d8fb523498cfd22803d009d0f9d30c6d64..ccb119b60087002e38e4f80e5a7d1a903550d866 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
+++ b/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp
@@ -468,6 +468,10 @@ void PresentationConnection::didClose(
       EventTypeNames::close, connectionCloseReasonToString(reason), message));
 }
 
+void PresentationConnection::didClose() {
+  didClose(WebPresentationConnectionCloseReason::Closed, "");
+}
+
 void PresentationConnection::didFinishLoadingBlob(DOMArrayBuffer* buffer) {
   ASSERT(!m_messages.isEmpty() && m_messages.first()->type == MessageTypeBlob);
   ASSERT(buffer && buffer->buffer());