Ensure that Metro chrome in ASH is able to connect to an existing desktop chrome AURA process.

chrome/browser/chrome_browser_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 "chrome/browser/chrome_browser_main.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 435 matching lines @@
 
   counter->AddTime(time);
 }
 
 bool ProcessSingletonNotificationCallback(const CommandLine& command_line,
                                           const FilePath& current_directory) {
   // Drop the request if the browser process is already in shutdown path.
   if (!g_browser_process || g_browser_process->IsShuttingDown())
     return false;
 
+  g_browser_process->PlatformSpecificCommandLineProcessing(command_line);
+
   // TODO(erikwright): Consider removing this - AFAIK it is no longer used.
   // Handle the --uninstall-extension startup action. This needs to done here
   // in the process that is running with the target profile, otherwise the
   // uninstall will fail to unload and remove all components.
   if (command_line.HasSwitch(switches::kUninstallExtension)) {
     // The uninstall extension switch can't be combined with the profile
     // directory switch.
     DCHECK(!command_line.HasSwitch(switches::kProfileDirectory));
 
     Profile* profile = ProfileManager::GetLastUsedProfile();
@@ skipping 1251 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }