Enable downloads UI for NTP-saved pages.

components/offline_pages/client_policy_controller.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/offline_pages/client_policy_controller.h"
 
 #include <utility>
 
 #include "base/time/time.h"
 #include "components/offline_pages/client_namespace_constants.h"
@@ skipping 29 matching lines @@
                               kDownloadNamespace, LifetimeType::PERSISTENT,
                               kUnlimitedPages, kUnlimitedPages)
                               .SetIsRemovedOnCacheReset(false)
                               .SetIsSupportedByDownload(true)
                               .Build()));
   policies_.insert(std::make_pair(
       kNTPSuggestionsNamespace,
       OfflinePageClientPolicyBuilder(kNTPSuggestionsNamespace,
                                      LifetimeType::PERSISTENT, kUnlimitedPages,
                                      kUnlimitedPages)
+          .SetIsSupportedByDownload(true)
           .Build()));
 
   // Fallback policy.
   policies_.insert(std::make_pair(
       kDefaultNamespace, MakePolicy(kDefaultNamespace, LifetimeType::TEMPORARY,
                                     base::TimeDelta::FromDays(1), 10, 1)));
 }
 
 ClientPolicyController::~ClientPolicyController() {}
 
@@ skipping 23 matching lines @@
     const std::string& name_space) const {
   return GetPolicy(name_space).feature_policy.is_removed_on_cache_reset;
 }
 
 bool ClientPolicyController::IsSupportedByDownload(
     const std::string& name_space) const {
   return GetPolicy(name_space).feature_policy.is_supported_by_download;
 }
 
 }  // namespace offline_pages