[DevTools] Dedicated frontend for debugging Node.

chrome/browser/devtools/chrome_devtools_manager_delegate.cc

Index: chrome/browser/devtools/chrome_devtools_manager_delegate.cc
diff --git a/chrome/browser/devtools/chrome_devtools_manager_delegate.cc b/chrome/browser/devtools/chrome_devtools_manager_delegate.cc
index eb4b9fb1468d394df65f856d41ba1cd3a0707c6f..101d544a6be728d7695c7639e35c8e0173ba8192 100644
--- a/chrome/browser/devtools/chrome_devtools_manager_delegate.cc
+++ b/chrome/browser/devtools/chrome_devtools_manager_delegate.cc
@@ -244,10 +244,9 @@ ChromeDevToolsManagerDelegate::SetRemoteLocations(
     content::DevToolsAgentHost* agent_host,
     int command_id,
     base::DictionaryValue* params) {
-  if (host_data_.find(agent_host) == host_data_.end()) {
-      return DevToolsProtocol::CreateInvalidParamsResponse(
-          command_id, "Cannot find agent host");
-  }
+  // Could have been created late.
+  if (host_data_.find(agent_host) == host_data_.end())
+    DevToolsAgentHostAttached(agent_host);
 
   std::set<net::HostPortPair> tcp_locations;
   base::ListValue* locations;