[DevTools] Make resource tree model optional

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
index f1b3451f39c199f8063c9248006bcf7017b3239a..78aec77844ae6c246481a0db319544dc4bec08d1 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
@@ -207,9 +207,12 @@ WebInspector.NetworkLogView.prototype = {
     targetAdded: function(target)
     {
         if (!target.parentTarget()) {
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
+            var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+            if (resourceTreeModel) {
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
+                resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
+            }
         }
         var networkLog = WebInspector.NetworkLog.fromTarget(target);
         if (networkLog)
@@ -223,9 +226,12 @@ WebInspector.NetworkLogView.prototype = {
     targetRemoved: function(target)
     {
         if (!target.parentTarget()) {
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
-            target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
+            var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+            if (resourceTreeModel) {
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
+                resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
+            }
         }
     },
 
@@ -732,7 +738,8 @@ WebInspector.NetworkLogView.prototype = {
                 selectedRequestsNumber++;
                 selectedTransferSize += requestTransferSize;
             }
-            if (request.url === request.target().resourceTreeModel.inspectedPageURL() && request.resourceType() === WebInspector.resourceTypes.Document)
+            var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(request.target());
+            if (request.url === resourceTreeModel.inspectedPageURL() && request.resourceType() === WebInspector.resourceTypes.Document)
                 baseTime = request.startTime;
             if (request.endTime > maxTime)
                 maxTime = request.endTime;