Initial implementation of stashed message ports, content side

content/child/webmessageportchannel_impl.h

Index: content/child/webmessageportchannel_impl.h
diff --git a/content/child/webmessageportchannel_impl.h b/content/child/webmessageportchannel_impl.h
index 4b9c273d01dcac2267d685d82950aceaa1d85364..c6306e85f624147ef967d3fdac57eaf7d5de20e7 100644
--- a/content/child/webmessageportchannel_impl.h
+++ b/content/child/webmessageportchannel_impl.h
@@ -69,6 +69,8 @@ class WebMessagePortChannelImpl
   void QueueMessages();
   int message_port_id() const { return message_port_id_; }
 
+  void set_is_stashed() { is_stashed_ = true; }
+
  private:
   friend class base::RefCountedThreadSafe<WebMessagePortChannelImpl>;
   ~WebMessagePortChannelImpl() override;
@@ -115,6 +117,7 @@ class WebMessagePortChannelImpl
   // base::Value instances as opposed to being serialized using the default
   // blink::WebSerializedScriptValue.
   bool send_messages_as_values_;
+  bool is_stashed_;
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMessagePortChannelImpl);