[DevTools] Dedicated frontend for debugging Node.

third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
index e170ff5a3fed8d652ddc2b21bdceaaf552255a42..31d26722eb46e2aa7e4c8c5f9472f290447f645f 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
@@ -340,6 +340,14 @@ SDK.TargetManager = class extends Common.Object {
   }
 
   _connectAndCreateMainTarget() {
+    if (Runtime.queryParam('nodeFrontend')) {
+      var target = new SDK.Target(
+          this, Common.UIString('Node'), SDK.Target.Capability.Target, this._createMainConnection.bind(this), null);
+      target.subTargetsManager = new SDK.SubTargetsManager(target);
+      target.setInspectedURL('Node');
+      return;
+    }
+
     var capabilities = SDK.Target.Capability.Browser | SDK.Target.Capability.DOM | SDK.Target.Capability.JS |
         SDK.Target.Capability.Log | SDK.Target.Capability.Network | SDK.Target.Capability.Target;
     if (Runtime.queryParam('isSharedWorker')) {