[subresource_filter] Display dev tools console message for subresource blocking

content/shell/test_runner/mock_web_document_subresource_filter.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 "content/shell/test_runner/mock_web_document_subresource_filter.h"
 
 #include <algorithm>
 
 #include "base/strings/string_util.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
@@ skipping 29 matching lines @@
                         return base::EndsWith(path, suffix,
                                               base::CompareCase::SENSITIVE);
                       }) == disallowed_path_suffixes_.end()
              ? kAllow
              : kDisallow;
 }
 
 void MockWebDocumentSubresourceFilter::ReportDisallowedLoad() {}
 
 bool MockWebDocumentSubresourceFilter::ShouldLogToConsole() {
-  return false;
+  return true;
 }
 
 }  // namespace test_runner