mojo: kill app_thread before unloading main app library and add tests

mojo/shell/desktop/mojo_main.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 "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/shell/child_process.h"
@@ skipping 15 matching lines @@
     child_process->Main();
   } else {
     gfx::GLSurface::InitializeOneOff();
 
     base::MessageLoop message_loop;
     mojo::shell::Context shell_context;
 
     const base::CommandLine& command_line =
         *base::CommandLine::ForCurrentProcess();
     if (command_line.HasSwitch(switches::kOrigin)) {
-      shell_context.mojo_url_resolver()->set_origin(
+      shell_context.mojo_url_resolver()->SetOrigin(
           command_line.GetSwitchValueASCII(switches::kOrigin));
     }
 
     std::vector<GURL> app_urls;
     base::CommandLine::StringVector args = command_line.GetArgs();
     for (base::CommandLine::StringVector::const_iterator it = args.begin();
          it != args.end();
          ++it)
       app_urls.push_back(GURL(*it));
 
     message_loop.PostTask(FROM_HERE,
                           base::Bind(mojo::shell::Run,
                                      &shell_context,
                                      app_urls));
 
     message_loop.Run();
   }
 
   return 0;
 }