Fix races when the same bits are downloaded from 2 URLs.

sky/tools/skydb

 #!/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.
 
 from skypy.skyserver import SkyServer
 import argparse
 import json
 import logging
 import os
@@ skipping 113 matching lines @@
         if is_android:
             shell_args += ['--origin=%s' % build_dir_url]
 
         # Desktop-only work-around for mojo crashing under chromoting.
         if not is_android and args.use_osmesa:
             shell_args.append(
                 '--args-for=mojo:native_viewport_service --use-osmesa')
 
         if is_android and args.gdb:
             shell_args.append('--wait-for-debugger')
+            shell_args.append('--predictable-app-filenames')
 
         if 'remote_sky_server_port' in self.pids:
             shell_command = self._wrap_for_android(shell_args)
         else:
             shell_command = [self.paths.mojo_shell_path] + shell_args
 
         return shell_command
 
     def sky_server_for_args(self, args, packages_root):
         # FIXME: This is a hack.  sky_server should just take a build_dir
@@ skipping 465 matching lines @@
         load_parser.set_defaults(func=self.load_command)
 
         args = parser.parse_args()
         args.func(args)
 
         self._write_pid_file(PID_FILE_PATH, self.pids)
 
 
 if __name__ == '__main__':
     SkyDebugger().main()