Add cloud_print to the GN build.

cloud_print/service/win/cloud_print_service.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.
 
 // Work around warning in atlbase.h
 // https://connect.microsoft.com/VisualStudio/feedback/details/1032199/atlbase-h-gives-warning-c4189-when-compiling-with-atl-no-com-support
 #pragma warning(push)
 #pragma warning(disable:4189)
 #include <atlbase.h>
 #pragma warning(pop)
@@ skipping 343 matching lines @@
         cloud_print::LoadLocalString(IDS_ADD_PRINTERS_USING_CHROME);
     std::cout << "\n" << message.c_str() << "\n" ;
     std::string new_contents =
         ChromeLauncher::CreateServiceStateFile(proxy_id, printers);
 
     if (new_contents.empty()) {
       return ReportError(E_FAIL, IDS_ERROR_FAILED_CREATE_CONFIG);
     }
 
     if (new_contents != contents) {
-      size_t  written = base::WriteFile(file, new_contents.c_str(),
-                                              new_contents.size());
+      size_t written = base::WriteFile(
+          file, new_contents.c_str(), static_cast<int>(new_contents.size()));
       if (written != new_contents.size()) {
         return ReportError(cloud_print::GetLastHResult(),
                            IDS_ERROR_FAILED_CREATE_CONFIG);
       }
     }
 
     return S_OK;
   }
 
   void CheckRequirements() {
@@ skipping 45 matching lines @@
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
 
   logging::SetMinLogLevel(
       command_line->HasSwitch(switches::kEnableLogging) ?
       logging::LOG_INFO : logging::LOG_FATAL);
 
   return _AtlModule.WinMain(0);
 }