DevTools: ResourceTreeModel should not report resources twice

third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
index 16a0c772c8340984cc20ee6d252f18faa0160b8a..85311fc85436994fbabf1e55d3d5cb2288190cae 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
@@ -321,10 +321,6 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
     var frame = new SDK.ResourceTreeFrame(this, parentFrame, framePayload.id, framePayload, null);
     this._addFrame(frame);
 
-    var frameResource = this._createResourceFromFramePayload(
-        framePayload, framePayload.url, Common.resourceTypes.Document, framePayload.mimeType, null, null);
-    frame.addResource(frameResource);
-
     for (var i = 0; frameTreePayload.childFrames && i < frameTreePayload.childFrames.length; ++i)
       this._addFramesRecursively(frame, frameTreePayload.childFrames[i]);
 
@@ -335,6 +331,12 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
           subresource.lastModified || null, subresource.contentSize || null);
       frame.addResource(resource);
     }
+
+    if (!frame._resourcesMap[framePayload.url]) {
+      var frameResource = this._createResourceFromFramePayload(
+          framePayload, framePayload.url, Common.resourceTypes.Document, framePayload.mimeType, null, null);
+      frame.addResource(frameResource);
+    }
   }
 
   /**