Never launch a new window when --no-startup-window is specified.

chrome/browser/ui/startup/startup_browser_creator.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 "chrome/browser/ui/startup/startup_browser_creator.h"
 
 #include <algorithm>   // For max().
 #include <set>
 
 #include "apps/app_load_service.h"
@@ skipping 582 matching lines @@
     base::FilePath output_file(
         command_line.GetSwitchValuePath(switches::kDumpBrowserHistograms));
     if (!output_file.empty()) {
       BrowserThread::PostBlockingPoolTask(
           FROM_HERE,
           base::Bind(&DumpBrowserHistograms, output_file));
     }
     silent_launch = true;
   }
 
+  // If --no-startup-window is specified and Chrome is already running then do
+  // not open a new window.
+  if (!process_startup && command_line.HasSwitch(switches::kNoStartupWindow))
+    silent_launch = true;
+
   // If we don't want to launch a new browser window or tab we are done here.
   if (silent_launch)
     return true;
 
   VLOG(2) << "ProcessCmdLineImpl: PLACE 4.A";
   if (command_line.HasSwitch(extensions::switches::kLoadApps) &&
       !IncognitoModePrefs::ShouldLaunchIncognito(
           command_line, last_used_profile->GetPrefs())) {
     if (!ProcessLoadApps(command_line, cur_dir, last_used_profile))
       return false;
@@ skipping 243 matching lines @@
   // If we are showing the app list then chrome isn't shown so load the app
   // list's profile rather than chrome's.
   if (command_line.HasSwitch(switches::kShowAppList)) {
     return AppListService::Get(chrome::HOST_DESKTOP_TYPE_NATIVE)->
         GetProfilePath(user_data_dir);
   }
 
   return g_browser_process->profile_manager()->GetLastUsedProfileDir(
       user_data_dir);
 }