Method cancelled

xds/src/test/java/io/grpc/xds/XdsTestUtils.java:112–115

(Context context)

        Context.current().addListener(
            new CancellationListener() {
              @Override
              public void cancelled(Context context) {
                lrsEnded.set(true);
              }
            }, MoreExecutors.directExecutor());
        loadReportCalls.offer(call);
        return requestObserver;