Allow passing listening socket path on command line

mojo/shell/context.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.
 
 #include "mojo/shell/context.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 167 matching lines @@
       new TaskRunners(base::MessageLoop::current()->message_loop_proxy()));
 
   for (size_t i = 0; i < arraysize(kLocalMojoURLs); ++i)
     mojo_url_resolver_.AddLocalFileMapping(GURL(kLocalMojoURLs[i]));
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
   if (command_line->HasSwitch(switches::kEnableExternalApplications)) {
     listener_ = ExternalApplicationListener::Create(
         task_runners_->shell_runner(), task_runners_->io_runner());
+
+    base::FilePath socket_path =
+        command_line->GetSwitchValuePath(switches::kEnableExternalApplications);
+    if (socket_path.empty())
+      socket_path = ExternalApplicationListener::ConstructDefaultSocketPath();
+
     listener_->ListenInBackground(
-        ExternalApplicationListener::ConstructDefaultSocketPath(),
+        socket_path,
         base::Bind(&ApplicationManager::RegisterExternalApplication,
                    base::Unretained(&application_manager_)));
   }
   scoped_ptr<DynamicServiceRunnerFactory> runner_factory;
   if (command_line->HasSwitch(switches::kEnableMultiprocess))
     runner_factory.reset(new OutOfProcessDynamicServiceRunnerFactory());
   else
     runner_factory.reset(new InProcessDynamicServiceRunnerFactory());
 
   DynamicApplicationLoader* dynamic_application_loader =
@@ skipping 62 matching lines @@
 ScopedMessagePipeHandle Context::ConnectToServiceByName(
     const GURL& application_url,
     const std::string& service_name) {
   app_urls_.insert(application_url);
   return application_manager_.ConnectToServiceByName(
       application_url, service_name).Pass();
 }
 
 }  // namespace shell
 }  // namespace mojo