[DevTools] Show blocked requests in Network panel.

Source/devtools/front_end/sdk/NetworkManager.js

 /*
  * Copyright (C) 2011 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 413 matching lines @@
         this._finishNetworkRequest(networkRequest, finishTime, encodedDataLength);
     },
 
     /**
      * @override
      * @param {!NetworkAgent.RequestId} requestId
      * @param {!NetworkAgent.Timestamp} time
      * @param {!PageAgent.ResourceType} resourceType
      * @param {string} localizedDescription
      * @param {boolean=} canceled
-     * @param {boolean=} blocked
+     * @param {!NetworkAgent.BlockedReason=} blockedReason
      */
-    loadingFailed: function(requestId, time, resourceType, localizedDescription, canceled, blocked)
+    loadingFailed: function(requestId, time, resourceType, localizedDescription, canceled, blockedReason)
     {
         var networkRequest = this._inflightRequestsById[requestId];
         if (!networkRequest)
             return;
 
         networkRequest.failed = true;
         networkRequest.setResourceType(WebInspector.resourceTypes[resourceType]);
         networkRequest.canceled = canceled;
-        networkRequest.blocked = blocked;
+        if (blockedReason)
+            networkRequest.setBlockedReason(blockedReason);
         networkRequest.localizedFailDescription = localizedDescription;
         this._finishNetworkRequest(networkRequest, time, -1);
     },
 
     /**
      * @override
      * @param {!NetworkAgent.RequestId} requestId
      * @param {string} requestURL
      */
     webSocketCreated: function(requestId, requestURL)
@@ skipping 307 matching lines @@
             target.networkAgent().removeBlockedURL(url);
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @type {!WebInspector.MultitargetNetworkManager}
  */
 WebInspector.multitargetNetworkManager;