android: use common known_devices_file path from chromium_android

scripts/slave/recipe_modules/chromium_tests/steps.py

 # 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 re
 import string
 
 
 class Test(object):
   """
@@ skipping 516 matching lines @@
         str(script_spec['name']),
         script_spec['script'],
         scripts_compile_targets,
         script_spec.get('args', []),
         script_spec.get('override_compile_targets', []))
 
 
 class DynamicPerfTests(Test):
   def __init__(self, perf_id, platform, target_bits, max_battery_temp=None,
                num_device_shards=1, num_host_shards=1, shard_index=0,
-               known_devices_file=None, override_browser_name=None):
+               override_browser_name=None):
     self._perf_id = perf_id
     self._platform = platform
     self._target_bits = target_bits
 
     self._max_battery_temp = max_battery_temp
     self._num_host_shards = num_host_shards
     self._num_device_shards = num_device_shards
     self._shard_index = shard_index
-    self._known_devices_file = known_devices_file
 
     if override_browser_name:
       self._browser_name = override_browser_name
     else:
       if platform == 'android':
         self._browser_name = 'android-chromium'
       elif platform == 'win' and target_bits == 64:
         self._browser_name = 'release_x64'
       else:
         self._browser_name ='release'
@@ skipping 27 matching lines @@
         device=device).json.output
 
     tests['steps'] = {k: v for k, v in tests['steps'].iteritems()
         if v['device_affinity'] / self._num_device_shards == self._shard_index}
     for test_info in tests['steps'].itervalues():
       test_info['device_affinity'] %= self._num_device_shards
 
     return tests
 
   def _run_sharded(self, api, tests):
-    known_devices_file = (
-        api.path['build'].join(
-            'site_config', self._known_devices_file) if self._known_devices_file
-        else None)
     api.chromium_android.run_sharded_perf_tests(
       config=api.json.input(data=tests),
       perf_id=self._perf_id,
       chartjson_file=True,
       max_battery_temp=self._max_battery_temp,
-      known_devices_file=known_devices_file)
+      known_devices_file=api.chromium_android.known_devices_file)
 
   def _run_serially(self, api, tests):
     failure = None
     for test_name, test in sorted(tests['steps'].iteritems()):
       test_name = str(test_name)
       annotate = api.chromium.get_annotate_by_test_name(test_name)
       cmd = test['cmd'].split()
       try:
         api.chromium.runtest(
             cmd[1] if len(cmd) > 1 else cmd[0],
@@ skipping 1247 matching lines @@
   def run(self, api, suffix, test_filter=None):
     api.chromium_android.coverage_report(upload=False)
     api.chromium_android.get_changed_lines_for_revision()
     api.chromium_android.incremental_coverage_report()
 
 
 GOMA_TESTS = [
   GTestTest('base_unittests'),
   GTestTest('content_unittests'),
 ]