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

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications.",
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                 "description": "Returns content served for the given request.",
                 "parameters": [
                     { "name": "requestId", "$ref": "RequestId", "description": "Identifier of the network request to get content for." }
                 ],
                 "returns": [
                     { "name": "body", "type": "string", "description": "Response body." },
                     { "name": "base64Encoded", "type": "boolean", "description": "True, if content was sent as base64." }
                 ]
             },
             {
+                "name": "addBlockedURL",
+                "description": "Blocks specific URL from loading.",
+                "parameters": [
+                    { "name": "url", "type": "string", "description": "URL to block." }
+                ],
+                "hidden": true
+            },
+            {
+                "name": "removeBlockedURL",
+                "description": "Cancels blocking of a specific URL from loading.",
+                "parameters": [
+                    { "name": "url", "type": "string", "description": "URL to stop blocking." }
+                ],
+                "hidden": true
+            },
+            {
                 "name": "replayXHR",
                 "description": "This method sends a new XMLHttpRequest which is identical to the original one. The following parameters should be identical: method, url, async, request body, extra headers, withCredentials attribute, user, password.",
                 "parameters": [
                     { "name": "requestId", "$ref": "RequestId", "description": "Identifier of XHR to replay." }
                 ],
                 "hidden": true
             },
             {
                 "name": "setMonitoringXHREnabled",
                 "parameters": [
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                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$ref": "AXNode", "description": "The <code>Accessibility.AXNode</code> for this DOM node, if it exists.", "optional": true }
                 ],
                 "description": "Fetches the accessibility node for this DOM node, if it exists.",
                 "hidden": true
             }
         ]
     }]
 }