Move the apptest runner and parts of mopy to the public SDK.

mojo/tools/android_mojo_shell.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import argparse
 import logging
 import sys
 
+import add_sdk_tools_to_path
+from mopy import android
 from mopy.config import Config
 from mopy.paths import Paths
-from mopy import android
+
 
 USAGE = ("android_mojo_shell.py "
          "[--args-for=<mojo-app>] "
          "[--content-handlers=<handlers>] "
          "[--enable-external-applications] "
          "[--disable-cache] "
          "[--enable-multiprocess] "
          "[--url-mappings=from1=to1,from2=to2] "
          "[<mojo-app>] "
          """
@@ skipping 23 matching lines @@
   context = android.PrepareShellRun(config)
   android.CleanLogs(context)
   p = android.ShowLogs()
   android.StartShell(context, args, sys.stdout, p.terminate)
 
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())