Implemented port filter for URLMatcher

chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
 
 namespace extensions {
 namespace declarative_webrequest_constants {
 
 // Signals to which WebRequestRulesRegistries are registered.
 const char kOnRequest[] = "experimental.webRequest.onRequest";
 
 // Keys of dictionaries.
 const char kInstanceTypeKey[] = "instanceType";
+const char kPortsKey[] = "ports";
 const char kRedirectUrlKey[] = "redirectUrl";
 const char kResourceTypeKey[] = "resourceType";
 const char kSchemesKey[] = "schemes";
 
 // Values of dictionaries, in particular instance types
 const char kCancelRequestType[] = "experimental.webRequest.CancelRequest";
 const char kRedirectRequestType[] = "experimental.webRequest.RedirectRequest";
 const char kRequestMatcherType[] = "experimental.webRequest.RequestMatcher";
 
 
 }  // namespace declarative_webrequest_constants
 }  // namespace extensions