Android: first step into making "perf tests" reuse the functional test infra.

build/android/pylib/base/test_dispatcher.py

 # 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.
 
 """Dispatches tests, either sharding or replicating them.
 
 To dispatch, performs the following steps:
 * Create a test collection factory, using the given tests
   - If sharding: test collection factory returns the same shared test collection
     to all test runners
@@ skipping 312 matching lines @@
   if test_device:
     assert test_device in attached_devices, (
         'Did not find device %s among attached device. Attached devices: %s'
         % (test_device, ', '.join(attached_devices)))
     attached_devices = [test_device]
 
   if len(attached_devices) > 1 and wait_for_debugger:
     logging.warning('Debugger can not be sharded, using first available device')
     attached_devices = attached_devices[:1]
 
-  return attached_devices
+  return sorted(attached_devices)
 
 
 def RunTests(tests, runner_factory, wait_for_debugger, test_device,
              shard=True,
              build_type='Debug',
              test_timeout=DEFAULT_TIMEOUT,
              setup_timeout=DEFAULT_TIMEOUT,
              num_retries=2):
   """Run all tests on attached devices, retrying tests that don't pass.
 
@@ skipping 40 matching lines @@
   logging.info('Will run %d tests (%s): %s', len(tests), log_string, str(tests))
   runners = _CreateRunners(runner_factory, devices, setup_timeout)
   try:
     return _RunAllTests(runners, test_collection_factory,
                         num_retries, test_timeout, tag_results_with_device)
   finally:
     try:
       _TearDownRunners(runners, setup_timeout)
     except android_commands.errors.DeviceUnresponsiveError as e:
       logging.warning('Device unresponsive during TearDown: [%s]', e)