DevTools: provide an option to return traces as streams

content/browser/devtools/browser_devtools_agent_host.cc

Index: content/browser/devtools/browser_devtools_agent_host.cc
diff --git a/content/browser/devtools/browser_devtools_agent_host.cc b/content/browser/devtools/browser_devtools_agent_host.cc
index e7dbaa60098095004a5e85df64d6306249d4c435..aefdc1486f0072708704028839b308a8d00af183 100644
--- a/content/browser/devtools/browser_devtools_agent_host.cc
+++ b/content/browser/devtools/browser_devtools_agent_host.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "content/browser/devtools/devtools_protocol_handler.h"
+#include "content/browser/devtools/protocol/io_handler.h"
 #include "content/browser/devtools/protocol/system_info_handler.h"
 #include "content/browser/devtools/protocol/tethering_handler.h"
 #include "content/browser/devtools/protocol/tracing_handler.h"
@@ -21,17 +22,19 @@ scoped_refptr<DevToolsAgentHost> DevToolsAgentHost::CreateForBrowser(
 BrowserDevToolsAgentHost::BrowserDevToolsAgentHost(
     scoped_refptr<base::SingleThreadTaskRunner> tethering_task_runner,
     const CreateServerSocketCallback& socket_callback)
-    : system_info_handler_(new devtools::system_info::SystemInfoHandler()),
+    : io_handler_(new devtools::io::IOHandler(GetIOContext())),
+      system_info_handler_(new devtools::system_info::SystemInfoHandler()),
       tethering_handler_(
           new devtools::tethering::TetheringHandler(socket_callback,
                                                     tethering_task_runner)),
       tracing_handler_(new devtools::tracing::TracingHandler(
-          devtools::tracing::TracingHandler::Browser)),
+          devtools::tracing::TracingHandler::Browser, GetIOContext())),
       protocol_handler_(new DevToolsProtocolHandler(
           this,
           base::Bind(&BrowserDevToolsAgentHost::SendMessageToClient,
                      base::Unretained(this)))) {
   DevToolsProtocolDispatcher* dispatcher = protocol_handler_->dispatcher();
+  dispatcher->SetIOHandler(io_handler_.get());
   dispatcher->SetSystemInfoHandler(system_info_handler_.get());
   dispatcher->SetTetheringHandler(tethering_handler_.get());
   dispatcher->SetTracingHandler(tracing_handler_.get());