Add --headless flag to Windows

chrome/app/chrome_main.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.
 
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/app/chrome_main_delegate.h"
@@ skipping 68 matching lines @@
   CHECK(DumpProcess);
   base::debug::SetDumpWithoutCrashingFunction(DumpProcess);
 
   // Verify that chrome_elf and this module (chrome.dll and chrome_child.dll)
   // have the same version.
   if (install_static::InstallDetails::Get().VersionMismatch())
     base::debug::DumpWithoutCrashing();
 #else
   params.argc = argc;
   params.argv = argv;
-#endif
-
-#if !defined(OS_WIN)
   base::CommandLine::Init(params.argc, params.argv);
+#endif  // defined(OS_WIN)
+  base::CommandLine::Init(0, nullptr);
   const base::CommandLine* command_line(base::CommandLine::ForCurrentProcess());
   ALLOW_UNUSED_LOCAL(command_line);
-#endif
 
-#if defined(OS_LINUX) || defined(OS_MACOSX)
+#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
   if (command_line->HasSwitch(switches::kHeadless)) {
 #if defined(OS_MACOSX)
     SetUpBundleOverrides();
 #endif
-    return headless::HeadlessShellMain(argc, argv);
+    return headless::HeadlessShellMain(params);
   }
-#endif  // defined(OS_LINUX) || defined(OS_MACOSX)
+#endif  // defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
 
 #if defined(OS_CHROMEOS) && BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
   if (service_manager::ServiceManagerIsRemote())
     params.env_mode = aura::Env::Mode::MUS;
 #endif  // BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
 
   int rv = content::ContentMain(params);
 
 #if defined(OS_WIN)
   base::win::SetShouldCrashOnProcessDetach(false);
 #endif
 
   return rv;
 }