Enable WorkerTest.WorkerContextMultiPort.

chrome/common/webmessageportchannel_impl.cc

Index: chrome/common/webmessageportchannel_impl.cc
diff --git a/chrome/common/webmessageportchannel_impl.cc b/chrome/common/webmessageportchannel_impl.cc
index 4ff8b550e7bacf9baa77475639a47270e801f3f9..24304fd3351d44021041bc9e0e94a69d8263afcb 100644
--- a/chrome/common/webmessageportchannel_impl.cc
+++ b/chrome/common/webmessageportchannel_impl.cc
@@ -151,6 +151,11 @@ void WebMessagePortChannelImpl::Entangle(
 }
 
 void WebMessagePortChannelImpl::QueueMessages() {
+  if (MessageLoop::current() != ChildThread::current()->message_loop()) {
+    ChildThread::current()->message_loop()->PostTask(FROM_HERE,
+        NewRunnableMethod(this, &WebMessagePortChannelImpl::QueueMessages));
+    return;
+  }
   // This message port is being sent elsewhere (perhaps to another process).
   // The new endpoint needs to receive the queued messages, including ones that
   // could still be in-flight.  So we tell the browser to queue messages, and it