[DevTools] Make resource tree model optional

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 138 matching lines @@
     DatabaseLoaded: "DatabaseLoaded"
 }
 
 WebInspector.IndexedDBModel.prototype = {
     enable: function()
     {
         if (this._enabled)
             return;
 
         this._agent.enable();
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this.target());
 
-        this.target().resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginAdded, this._securityOriginAdded, this);
-        this.target().resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginRemoved, this._securityOriginRemoved, this);
+        if (resourceTreeModel) {

[dgozman, 2016/07/14 16:29:28]

ditto

[eostroukhov-old, 2016/07/20 23:46:15]

Done.

+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginAdded, this._securityOriginAdded, this);
+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginRemoved, this._securityOriginRemoved, this);
 
-        var securityOrigins = this.target().resourceTreeModel.securityOrigins();
-        for (var i = 0; i < securityOrigins.length; ++i)
-            this._addOrigin(securityOrigins[i]);
+            var securityOrigins = resourceTreeModel.securityOrigins();
+            for (var i = 0; i < securityOrigins.length; ++i)
+                this._addOrigin(securityOrigins[i]);
+        }
 
         this._enabled = true;
     },
 
     /**
      * @param {string} origin
      */
     clearForOrigin: function(origin)
     {
         if (!this._enabled)
@@ skipping 357 matching lines @@
  * @param {!WebInspector.Target} target
  * @return {?WebInspector.IndexedDBModel}
  */
 WebInspector.IndexedDBModel.fromTarget = function(target)
 {
     var model = /** @type {?WebInspector.IndexedDBModel} */ (target.model(WebInspector.IndexedDBModel));
     if (!model)
         model = new WebInspector.IndexedDBModel(target);
     return model;
 }