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

build/android/pylib/local/device/local_device_gtest_run.py

Index: build/android/pylib/local/device/local_device_gtest_run.py
diff --git a/build/android/pylib/local/device/local_device_gtest_run.py b/build/android/pylib/local/device/local_device_gtest_run.py
index 6bd06dd2fa16d608c61cc7894dd8547944ba404c..552379dd6cb768091eb12be22186f5bfa73df7aa 100644
--- a/build/android/pylib/local/device/local_device_gtest_run.py
+++ b/build/android/pylib/local/device/local_device_gtest_run.py
@@ -388,17 +388,19 @@ class LocalDeviceGtestRun(local_device_test_run.LocalDeviceTestRun):
         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: