mojo_js_standalone will quit after the last JSApp quits

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 <algorithm>
+
 #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 "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/shell/child_process.h"
 #include "mojo/shell/context.h"
 #include "mojo/shell/init.h"
@@ skipping 13 matching lines @@
 #if defined(OS_WIN)
 void SplitString(const base::string16& str, std::vector<std::string>* argv) {
   base::SplitString(base::UTF16ToUTF8(str), ' ', argv);
 }
 #elif defined(OS_POSIX)
 void SplitString(const std::string& str, std::vector<std::string>* argv) {
   base::SplitString(str, ' ', argv);
 }
 #endif
 
+bool is_empty(const std::string& s) {
+  return s.empty();
+}
+
 // The value of app_url_and_args is "<mojo_app_url> [<args>...]", where args
 // is a list of "configuration" arguments separated by spaces. If one or more
 // arguments are specified they will be available when the Mojo application
 // is initialized. See ApplicationImpl::args().
 GURL GetAppURLAndSetArgs(const base::CommandLine::StringType& app_url_and_args,
                          mojo::shell::Context* context) {
+  // SplitString() returns empty strings for extra delimeter characters (' ').
   std::vector<std::string> argv;
   SplitString(app_url_and_args, &argv);
+  argv.erase(std::remove_if(argv.begin(), argv.end(), is_empty), argv.end());
+
   if (argv.empty())
     return GURL::EmptyGURL();
   GURL app_url(argv[0]);
   if (argv.size() > 1)
     context->application_manager()->SetArgsForURL(argv, app_url);
   return app_url;
 }
 
 void RunApps(mojo::shell::Context* context) {
   const auto& command_line = *base::CommandLine::ForCurrentProcess();
@@ skipping 42 matching lines @@
         if (kv.first == switches::kArgsFor)
           GetAppURLAndSetArgs(kv.second, &shell_context);
       }
 
       message_loop.PostTask(FROM_HERE, base::Bind(RunApps, &shell_context));
       message_loop.Run();
     }
   }
   return 0;
 }