Headless: Support sending and receiving of raw protocol messages

headless/lib/browser/headless_devtools_client_impl.h

Index: headless/lib/browser/headless_devtools_client_impl.h
diff --git a/headless/lib/browser/headless_devtools_client_impl.h b/headless/lib/browser/headless_devtools_client_impl.h
index c7c248b472ef4f8d8fa3b1be2f35c8eecfd9cdd4..26654c59fb2f860daece8da4fe0e4efdefde3b75 100644
--- a/headless/lib/browser/headless_devtools_client_impl.h
+++ b/headless/lib/browser/headless_devtools_client_impl.h
@@ -93,6 +93,9 @@ class HeadlessDevToolsClientImpl : public HeadlessDevToolsClient,
   service_worker::Domain* GetServiceWorker() override;
   target::Domain* GetTarget() override;
   tracing::Domain* GetTracing() override;
+  void SetRawProtocolListener(
+      RawProtocolListener* raw_protocol_listener) override;
+  void SendRawDevtoolsMessage(const std::string& json_message) override;
 
   // content::DevToolstAgentHostClient implementation:
   void DispatchProtocolMessage(content::DevToolsAgentHost* agent_host,
@@ -151,7 +154,8 @@ class HeadlessDevToolsClientImpl : public HeadlessDevToolsClient,
                          const EventHandler* event_handler,
                          const base::DictionaryValue* result_dict);
 
-  content::DevToolsAgentHost* agent_host_;  // Not owned.
+  content::DevToolsAgentHost* agent_host_;      // Not owned.
+  RawProtocolListener* raw_protocol_listener_;  // Not owned.
   int next_message_id_;
   std::unordered_map<int, Callback> pending_messages_;