Turn on the trailers support flag in the toy QUIC client.

net/tools/quic/quic_simple_client_bin.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.
 
 // A binary wrapper for QuicClient.
 // Connects to a host using QUIC, sends a request to the provided URL, and
 // displays the response.
 //
 // Some usage examples:
 //
@@ skipping 109 matching lines @@
 
 int main(int argc, char *argv[]) {
   base::CommandLine::Init(argc, argv);
   base::CommandLine* line = base::CommandLine::ForCurrentProcess();
   const base::CommandLine::StringVector& urls = line->GetArgs();
 
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   CHECK(logging::InitLogging(settings));
 
+  FLAGS_quic_supports_trailers = true;
+
   if (line->HasSwitch("h") || line->HasSwitch("help") || urls.empty()) {
     const char* help_str =
         "Usage: quic_client [options] <url>\n"
         "\n"
         "<url> with scheme must be provided (e.g. http://www.google.com)\n\n"
         "Options:\n"
         "-h, --help                  show this help message and exit\n"
         "--host=<host>               specify the IP address of the hostname to "
         "connect to\n"
         "--port=<port>               specify the port to connect to\n"
@@ skipping 186 matching lines @@
       return 0;
     } else {
       cout << "Request failed (redirect " << response_code << ")." << endl;
       return 1;
     }
   } else {
     cerr << "Request failed (" << response_code << ")." << endl;
     return 1;
   }
 }