DevTools: allow reattaching main target live.

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

 // Copyright 2016 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.
 
 /**
  * @constructor
  * @extends {WebInspector.SDKModel}
  * @param {!WebInspector.Target} target
  */
 WebInspector.SubTargetsManager = function(target)
@@ skipping 47 matching lines @@
         this._agent.setAutoAttach(true /* autoAttach */, true /* waitForDebuggerOnStart */, fulfill);
         return promise;
     },
 
     /**
      * @override
      */
     dispose: function()
     {
         for (var connection of this._connections.values())
-            connection._close();
+            connection.close();
         this._connections.clear();
         this._attachedTargets.clear();
     },
 
     /**
      * @param {!TargetAgent.TargetID} targetId
      */
     activateTarget: function(targetId)
     {
         this._agent.activateTarget(targetId);
@@ skipping 108 matching lines @@
         this.dispatchEventToListeners(WebInspector.SubTargetsManager.Events.SubTargetAdded, target);
     },
 
     /**
      * @param {string} targetId
      */
     _detachedFromTarget: function(targetId)
     {
         var connection = this._connections.get(targetId);
         if (connection)
-            connection._close();
+            connection._reportClosed();
         this._connections.delete(targetId);
         var target = this._attachedTargets.get(targetId);
         this._attachedTargets.delete(targetId);
         this.dispatchEventToListeners(WebInspector.SubTargetsManager.Events.SubTargetRemoved, target);
     },
 
     /**
      * @param {string} targetId
      * @param {string} message
      */
@@ skipping 82 matching lines @@
 WebInspector.SubTargetConnection.prototype = {
     /**
      * @override
      * @param {!Object} messageObject
      */
     sendMessage: function(messageObject)
     {
         this._agent.sendMessageToTarget(this._targetId, JSON.stringify(messageObject));
     },
 
-    _close: function()
+    /**
+     * @override
+     */
+    forceClose: function()
+    {
+        this._agent.detachFromTarget(this._targetId);
+    },
+
+    _reportClosed: function()
     {
         this.connectionClosed("target_terminated");
     },
 
     __proto__: InspectorBackendClass.Connection.prototype
 }
 
 /**
  * @constructor
  * @param {!TargetAgent.TargetInfo} payload
  */
 WebInspector.TargetInfo = function(payload)
 {
     this.id = payload.targetId;
     this.url = payload.url;
     this.type = payload.type;
     if (this.type !== "page" && this.type !== "iframe") {
         this.title = WebInspector.UIString("Worker: %s", this.url);
         this.canActivate = false;
     } else {
         this.title = payload.title;
         this.canActivate = true;
     }
 }