[DevTools] Make resource tree model optional

third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 622 matching lines @@
 WebInspector.TimelineUIUtils.buildTraceEventDetails = function(event, model, linkifier, detailed, callback)
 {
     var target = model.target();
     if (!target) {
         callbackWrapper();
         return;
     }
     var relatedNodes = null;
     var barrier = new CallbackBarrier();
     if (!event.previewElement) {
-        if (event.url)
-            WebInspector.DOMPresentationUtils.buildImagePreviewContents(target, event.url, false, barrier.createCallback(saveImage));
-        else if (event.picture)
+        if (event.url) {
+            var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+            if (resourceTreeModel)
+                WebInspector.DOMPresentationUtils.buildImagePreviewContents(resourceTreeModel, event.url, false, barrier.createCallback(saveImage));
+        } else if (event.picture)
             WebInspector.TimelineUIUtils.buildPicturePreviewContent(event, target, barrier.createCallback(saveImage));
     }
     var nodeIdsToResolve = new Set();
     if (event.backendNodeId)
         nodeIdsToResolve.add(event.backendNodeId);
     if (event.invalidationTrackingEvents)
         WebInspector.TimelineUIUtils._collectInvalidationNodeIds(nodeIdsToResolve, event.invalidationTrackingEvents);
     if (nodeIdsToResolve.size) {
         var domModel = WebInspector.DOMModel.fromTarget(target);
         if (domModel)
@@ skipping 340 matching lines @@
     var sendRequest = request.children[0];
     var topFrame = WebInspector.TimelineUIUtils.topStackFrame(sendRequest);
     if (topFrame) {
         contentHelper.appendElementRow(title, linkifier.linkifyConsoleCallFrameForTimeline(target, topFrame));
     } else if (sendRequest.initiator) {
         var initiatorURL = WebInspector.TimelineUIUtils.eventURL(sendRequest.initiator);
         if (initiatorURL)
             contentHelper.appendElementRow(title, linkifier.linkifyScriptLocation(target, null, initiatorURL, 0));
     }
 
+    var resourceTreeModel = target && WebInspector.ResourceTreeModel.fromTarget(target);
+
     /**
      * @param {function(?Element)} fulfill
      */
     function action(fulfill)
     {
-        WebInspector.DOMPresentationUtils.buildImagePreviewContents(/** @type {!WebInspector.Target} */(target), request.url, false, saveImage);
+        WebInspector.DOMPresentationUtils.buildImagePreviewContents(/** @type {!WebInspector.ResourceTreeModel} */(resourceTreeModel), request.url, false, saveImage);
         /**
          * @param {!Element=} element
          */
         function saveImage(element)
         {
             request.previewElement = element || null;
             fulfill(request.previewElement);
         }
     }
     var previewPromise;
     if (request.previewElement)
         previewPromise = Promise.resolve(request.previewElement);
     else
-        previewPromise = request.url && target ? new Promise(action) : Promise.resolve(null);
+        previewPromise = request.url && resourceTreeModel ? new Promise(action) : Promise.resolve(null);
     /**
      * @param {?Element} element
      * @return {!DocumentFragment}
      */
     function appendPreview(element)
     {
         if (element)
             contentHelper.appendElementRow(WebInspector.UIString("Preview"), request.previewElement);
         return contentHelper.fragment;
     }
@@ skipping 1102 matching lines @@
     case warnings.V8Deopt:
         span.appendChild(WebInspector.linkifyURLAsNode("https://github.com/GoogleChrome/devtools-docs/issues/53",
             WebInspector.UIString("Not optimized"), undefined, true));
         span.createTextChild(WebInspector.UIString(": %s", eventData["deoptReason"]));
         break;
     default:
         console.assert(false, "Unhandled TimelineModel.WarningType");
     }
     return span;
 }