[android] Add support for passing command-line flags directly.

build/android/pylib/local/device/local_device_gtest_run.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 collections
 import itertools
 import logging
 import os
 import posixpath
 import time
@@ skipping 370 matching lines @@
     # Run the test.
     timeout = (self._test_instance.shard_timeout
                * self.GetTool(device).GetTimeoutScale())
     if self._test_instance.store_tombstones:
       tombstones.ClearAllTombstones(device)
     with device_temp_file.DeviceTempFile(
         adb=device.adb,
         dir=self._delegate.ResultsDirectory(device),
         suffix='.xml') as device_tmp_results_file:
 
-      flags = self._test_instance.test_arguments or ''
+      flags = list(self._test_instance.flags)
       if self._test_instance.enable_xml_result_parsing:
-        flags += ' --gtest_output=xml:%s' % device_tmp_results_file.name
-      if self._test_instance.gtest_also_run_disabled_tests:
-        flags += ' --gtest_also_run_disabled_tests'
+        flags.append('--gtest_output=xml:%s' % device_tmp_results_file.name)
+
+      logging.info('flags:')
+      for f in flags:
+        logging.info('  %s', f)
 
       with contextlib_ext.Optional(
           trace_event.trace(str(test)),
           self._env.trace_output):
         output = self._delegate.Run(
-            test, device, flags=flags,
+            test, device, flags=' '.join(flags),
             timeout=timeout, retries=0)
 
       if self._test_instance.enable_xml_result_parsing:
         gtest_xml = device.ReadFile(
             device_tmp_results_file.name,
             as_root=True)
 
     for s in self._servers[str(device)]:
       s.Reset()
     if self._test_instance.app_files:
@@ skipping 43 matching lines @@
     @local_device_environment.handle_shard_failures
     @trace_event.traced
     def individual_device_tear_down(dev):
       for s in self._servers.get(str(dev), []):
         s.TearDown()
 
       tool = self.GetTool(dev)
       tool.CleanUpEnvironment()
 
     self._env.parallel_devices.pMap(individual_device_tear_down)