Add the client for accessing Subresource Filter only list.

components/subresource_filter/core/common/activation_list.cc

 // Copyright 2016 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 "components/subresource_filter/core/common/activation_list.h"
 
 #include <ostream>
 
 #include "base/logging.h"
 
 namespace subresource_filter {
 
 std::ostream& operator<<(std::ostream& os, const ActivationList& type) {
   switch (type) {
     case ActivationList::NONE:
       os << "NONE";
       break;
     case ActivationList::SOCIAL_ENG_ADS_INTERSTITIAL:
       os << "SOCIAL_ENG_ADS_INTERSTITIAL";
       break;
     case ActivationList::PHISHING_INTERSTITIAL:
       os << "PHISHING_INTERSTITIAL";
       break;
+    case ActivationList::SUBRESOURCE_FILTER:
+      os << "SUBRESOURCE_FILTER";
+      break;
     default:
       NOTREACHED();
       break;
   }
   return os;
 }
 
 }  // namespace subresource_filter