[DevTools] Make resource tree model optional

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 7e09dff47441da4e36f267bab42c7633ea003b02..d54189a02c65d0c43a1479f21ea122c798c41891 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
@@ -85,7 +85,11 @@ WebInspector.TargetManager.prototype = {
         if (!this._targets.length)
             return "";
 
-        return this._targets[0].resourceTreeModel.inspectedPageURL();
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._targets[0]);
+        if (!resourceTreeModel)
+            return "";
+
+        return resourceTreeModel.inspectedPageURL();
     },
 
     /**
@@ -96,7 +100,11 @@ WebInspector.TargetManager.prototype = {
         if (!this._targets.length)
             return "";
 
-        return this._targets[0].resourceTreeModel.inspectedPageDomain();
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._targets[0]);
+        if (!resourceTreeModel)
+            return "";
+
+        return resourceTreeModel.inspectedPageDomain();
     },
 
     /**
@@ -113,8 +121,14 @@ WebInspector.TargetManager.prototype = {
      */
     reloadPage: function(bypassCache, injectedScript)
     {
-        if (this._targets.length)
-            this._targets[0].resourceTreeModel.reloadPage(bypassCache, injectedScript);
+        if (!this._targets.length)
+            return;
+
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._targets[0]);
+        if (!resourceTreeModel)
+            return;
+
+        resourceTreeModel.reloadPage(bypassCache, injectedScript);
     },
 
     /**
@@ -197,15 +211,11 @@ WebInspector.TargetManager.prototype = {
         /** @type {!WebInspector.ConsoleModel} */
         target.consoleModel = new WebInspector.ConsoleModel(target);
 
-        var networkManager = null;
-        if (!target.isJSInspector())
-            networkManager = new WebInspector.NetworkManager(target);
-
-        /** @type {!WebInspector.ResourceTreeModel} */
-        target.resourceTreeModel = new WebInspector.ResourceTreeModel(target, networkManager);
-
-        if (networkManager)
-            new WebInspector.NetworkLog(target, networkManager);
+        if (!target.isJSInspector()) {
+            var networkManager = new WebInspector.NetworkManager(target);
+            var resourceTreeModel = new WebInspector.ResourceTreeModel(target, networkManager);
+            new WebInspector.NetworkLog(target, networkManager, resourceTreeModel);
+        }
 
         /** @type {!WebInspector.RuntimeModel} */
         target.runtimeModel = new WebInspector.RuntimeModel(target);
@@ -254,11 +264,14 @@ WebInspector.TargetManager.prototype = {
     {
         this._targets.push(target);
         if (this._targets.length === 1) {
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.InspectedURLChanged, this._redispatchEvent, this);
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._redispatchEvent, this);
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._redispatchEvent, this);
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.PageReloadRequested, this._redispatchEvent, this);
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._redispatchEvent, this);
+            var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+            if (resourceTreeModel) {
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.InspectedURLChanged, this._redispatchEvent, this);
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._redispatchEvent, this);
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._redispatchEvent, this);
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.PageReloadRequested, this._redispatchEvent, this);
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._redispatchEvent, this);
+            }
         }
         var copy = this._observersByType(target.type());
         for (var i = 0; i < copy.length; ++i)
@@ -281,10 +294,13 @@ WebInspector.TargetManager.prototype = {
     {
         this._targets.remove(target);
         if (this._targets.length === 0) {
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.InspectedURLChanged, this._redispatchEvent, this);
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._redispatchEvent, this);
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._redispatchEvent, this);
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._redispatchEvent, this);
+            var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+            if (resourceTreeModel) {
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.InspectedURLChanged, this._redispatchEvent, this);
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._redispatchEvent, this);
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._redispatchEvent, this);
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._redispatchEvent, this);
+            }
         }
         var copy = this._observersByType(target.type());
         for (var i = 0; i < copy.length; ++i)