Make --gdb work for android

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 <iostream>
 
 #include "base/at_exit.h"
+#include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "shell/child_process.h"
 #include "shell/command_line_util.h"
 #include "shell/context.h"
 #include "shell/init.h"
 #include "shell/switches.h"
 
 namespace {
 
 #if defined(OS_LINUX)
 // Copied from ui/gfx/switches.cc to avoid a dependency on //ui/gfx
 const char kEnableHarfBuzzRenderText[] = "enable-harfbuzz-rendertext";
 #endif
 
 void Usage() {
   std::cerr << "Launch Mojo applications.\n";
   std::cerr
       << "Usage: mojo_shell"
       << " [--" << switches::kArgsFor << "=<mojo-app>]"
       << " [--" << switches::kContentHandlers << "=<handlers>]"
       << " [--" << switches::kEnableExternalApplications << "]"
       << " [--" << switches::kDisableCache << "]"
       << " [--" << switches::kEnableMultiprocess << "]"
       << " [--" << switches::kOrigin << "=<url-lib-path>]"
       << " [--" << switches::kURLMappings << "=from1=to1,from2=to2]"
+      << " [--" << switches::kWaitForDebugger << "]"
       << " <mojo-app> ...\n\n"
       << "A <mojo-app> is a Mojo URL or a Mojo URL and arguments within "
       << "quotes.\n"
       << "Example: mojo_shell \"mojo:js_standalone test.js\".\n"
       << "<url-lib-path> is searched for shared libraries named by mojo URLs.\n"
       << "The value of <handlers> is a comma separated list like:\n"
       << "text/html,mojo:html_viewer,"
       << "application/javascript,mojo:js_content_handler\n";
 }
 
@@ skipping 57 matching lines @@
       }
 
       message_loop.PostTask(
           FROM_HERE,
           base::Bind(&mojo::shell::RunCommandLineApps, &shell_context));
       message_loop.Run();
     }
   }
   return 0;
 }