DevTools: provide an option to return traces as streams

content/browser/devtools/browser_devtools_agent_host.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_BROWSER_DEVTOOLS_AGENT_HOST_H_
 #define CONTENT_BROWSER_DEVTOOLS_BROWSER_DEVTOOLS_AGENT_HOST_H_
 
 #include "content/browser/devtools/devtools_agent_host_impl.h"
 
 namespace content {
 
 class DevToolsProtocolHandler;
 
 namespace devtools {
+namespace io { class IOHandler; }
 namespace system_info { class SystemInfoHandler; }
 namespace tethering { class TetheringHandler; }
 namespace tracing { class TracingHandler; }
 }  // namespace devtools
 
 class BrowserDevToolsAgentHost : public DevToolsAgentHostImpl {
  private:
   friend class DevToolsAgentHost;
   BrowserDevToolsAgentHost(
       scoped_refptr<base::SingleThreadTaskRunner> tethering_task_runner,
       const CreateServerSocketCallback& socket_callback);
   ~BrowserDevToolsAgentHost() override;
 
   // DevToolsAgentHostImpl implementation.
   void Attach() override;
   void Detach() override;
 
   // DevToolsAgentHost implementation.
   Type GetType() override;
   std::string GetTitle() override;
   GURL GetURL() override;
   bool Activate() override;
   bool Close() override;
   bool DispatchProtocolMessage(const std::string& message) override;
 
+  scoped_ptr<devtools::io::IOHandler> io_handler_;
   scoped_ptr<devtools::system_info::SystemInfoHandler> system_info_handler_;
   scoped_ptr<devtools::tethering::TetheringHandler> tethering_handler_;
   scoped_ptr<devtools::tracing::TracingHandler> tracing_handler_;
   scoped_ptr<DevToolsProtocolHandler> protocol_handler_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_BROWSER_DEVTOOLS_AGENT_HOST_H_