DevTools: allow handing over the raw protocol connection to external clients and back.

third_party/WebKit/Source/devtools/front_end/resources/AppManifestView.js

 // Copyright (c) 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.VBox}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.AppManifestView = function()
@@ skipping 37 matching lines @@
 WebInspector.AppManifestView.prototype = {
     /**
      * @override
      * @param {!WebInspector.Target} target
      */
     targetAdded: function(target)
     {
         if (this._resourceTreeModel)
             return;
         var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+        if (!resourceTreeModel)
+            return;
         this._resourceTreeModel = resourceTreeModel;
         this._updateManifest();
         resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.Events.MainFrameNavigated, this._updateManifest, this);
     },
 
     /**
      * @override
      * @param {!WebInspector.Target} target
      */
     targetRemoved: function(target)
     {
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+        if (!this._resourceTreeModel || this._resourceTreeModel !== resourceTreeModel)
+            return;
+        resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.Events.MainFrameNavigated, this._updateManifest, this);
+        delete this._resourceTreeModel;
     },
 
     _updateManifest: function()
     {
         this._resourceTreeModel.fetchAppManifest(this._renderManifest.bind(this));
     },
 
     /**
      * @param {string} url
      * @param {?string} data
@@ skipping 56 matching lines @@
     {
         var target = WebInspector.targetManager.mainTarget();
         if (target && target.hasBrowserCapability()) {
             target.pageAgent().requestAppBanner();
             WebInspector.console.show();
         }
     },
 
     __proto__: WebInspector.VBox.prototype
 }