Add command line overrides for GCM checkin URL & MCS endpoint

google_apis/gcm/tools/mcs_probe.cc

 // Copyright 2013 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 standalone tool for testing MCS connections and the MCS client on their
 // own.
 
 #include <cstddef>
 #include <cstdio>
 #include <string>
@@ skipping 408 matching lines @@
       checkin_proto::ChromeBuildProto::CHANNEL_CANARY);
   chrome_build_proto.set_chrome_version(kChromeVersion);
 
   CheckinRequest::RequestInfo request_info(0,
                                            0,
                                            std::map<std::string, std::string>(),
                                            std::string(),
                                            chrome_build_proto);
 
   checkin_request_.reset(new CheckinRequest(
-      GServicesSettings::DefaultCheckinURL(),
+      GServicesSettings().GetCheckinURL(),
       request_info,
       kDefaultBackoffPolicy,
       base::Bind(&MCSProbe::OnCheckInCompleted, base::Unretained(this)),
       url_request_context_getter_.get(),
       &recorder_));
   checkin_request_->Start();
 }
 
 void MCSProbe::OnCheckInCompleted(
     const checkin_proto::AndroidCheckinResponse& checkin_response) {
@@ skipping 50 matching lines @@
 
   return 0;
 }
 
 }  // namespace
 }  // namespace gcm
 
 int main(int argc, char* argv[]) {
   return gcm::MCSProbeMain(argc, argv);
 }