[DevTools] Implementation of resource requests blocked by specific urls.

Source/devtools/front_end/network/NetworkLogView.js

Index: Source/devtools/front_end/network/NetworkLogView.js
diff --git a/Source/devtools/front_end/network/NetworkLogView.js b/Source/devtools/front_end/network/NetworkLogView.js
index 78012245807aceaa3565fd8478c55a8eb22a4758..37baa0e8a1e8bcbc3f6fda5ba13dbced5541c3ae 100644
--- a/Source/devtools/front_end/network/NetworkLogView.js
+++ b/Source/devtools/front_end/network/NetworkLogView.js
@@ -1289,6 +1289,15 @@ WebInspector.NetworkLogView.prototype = {
             } else {
                 contextMenu.appendItem(WebInspector.UIString("Copy as cURL"), this._copyCurlCommand.bind(this, request, "unix"));
             }
+
+            function toggleRequestURLBlocked()
+            {
+                WebInspector.multitargetNetworkManager.toggleURLBlocked(request.url);
+            }
+
+            var blocked = WebInspector.multitargetNetworkManager.blockedURLs().has(request.url);
+            contextMenu.appendSeparator();
+            contextMenu.appendItem(blocked ? WebInspector.UIString.capitalize("Unblock ^request URL") : WebInspector.UIString.capitalize("Block ^request URL"), toggleRequestURLBlocked);
         }
         contextMenu.appendItem(WebInspector.UIString.capitalize("Copy ^all as HAR"), this._copyAll.bind(this));