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..1b1796736a3567a662b50e85fd0463b569ed204b 100644
--- a/headless/lib/browser/headless_devtools_client_impl.h
+++ b/headless/lib/browser/headless_devtools_client_impl.h
@@ -93,6 +93,11 @@ class HeadlessDevToolsClientImpl : public HeadlessDevToolsClient,
   service_worker::Domain* GetServiceWorker() override;
   target::Domain* GetTarget() override;
   tracing::Domain* GetTracing() override;
+  void SetRawProtocolListener(
+      RawProtocolListener* raw_protocol_listener) override;
+  int GetNextRawDevToolsMessageId() override;
+  void SendRawDevToolsMessage(const std::string& json_message) override;
+  void SendRawDevToolsMessage(const base::DictionaryValue& message) override;
 
   // content::DevToolstAgentHostClient implementation:
   void DispatchProtocolMessage(content::DevToolsAgentHost* agent_host,
@@ -151,8 +156,10 @@ 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_;
+  int next_raw_message_id_;
   std::unordered_map<int, Callback> pending_messages_;
 
   EventHandlerMap event_handlers_;