[DevTools] Make resource tree model optional

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

Index: third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkersView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkersView.js b/third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkersView.js
index 74c4c81cb0a376027199fd532f67d6ee649b4668..074adac819fd09c5bb58381dde5f1ddbc9e601f1 100644
--- a/third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkersView.js
+++ b/third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkersView.js
@@ -53,8 +53,11 @@ WebInspector.ServiceWorkersView.prototype = {
         this._manager.addEventListener(WebInspector.ServiceWorkerManager.Events.RegistrationUpdated, this._registrationUpdated, this);
         this._manager.addEventListener(WebInspector.ServiceWorkerManager.Events.RegistrationDeleted, this._registrationDeleted, this);
         this._manager.addEventListener(WebInspector.ServiceWorkerManager.Events.RegistrationErrorAdded, this._registrationErrorAdded, this);
-        this._target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginAdded, this._updateSectionVisibility, this);
-        this._target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginRemoved, this._updateSectionVisibility, this);
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._target);

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

ditto

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

Done.

+        if (resourceTreeModel) {
+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginAdded, this._updateSectionVisibility, this);
+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.SecurityOriginRemoved, this._updateSectionVisibility, this);
+        }
     },
 
     /**
@@ -70,7 +73,8 @@ WebInspector.ServiceWorkersView.prototype = {
 
     _updateSectionVisibility: function()
     {
-        var securityOrigins = new Set(this._target.resourceTreeModel.securityOrigins());
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._target);
+        var securityOrigins = new Set(resourceTreeModel ? resourceTreeModel.securityOrigins() : []);
         for (var section of this._sections.values()) {
             var visible = this._showAllCheckbox.checked() || securityOrigins.has(section._registration.securityOrigin);
             section._section.element.classList.toggle("hidden", !visible);