Use logdog butler subcommand to run tests.

tools/mb/mb.py

Index: tools/mb/mb.py
diff --git a/tools/mb/mb.py b/tools/mb/mb.py
index edbb434d27bfb36a9f3f4d1e8c0ab59231e909a3..77b927f434c5d9a82f98939a45675c8ad01aa0bf 100755
--- a/tools/mb/mb.py
+++ b/tools/mb/mb.py
@@ -1086,23 +1086,24 @@ class MetaBuildWrapper(object):
                                 output_path=None)
 
     if android and test_type != "script":
-      logdog_command = [
-          '--logdog-bin-cmd', './../../bin/logdog_butler',
-          '--project', 'chromium',
-          '--service-account-json',
-          '/creds/service_accounts/service-account-luci-logdog-publisher.json',
-          '--prefix', 'android/swarming/logcats/${SWARMING_TASK_ID}',
-          '--source', '${ISOLATED_OUTDIR}/logcats',
-          '--name', 'unified_logcats',
-      ]
       test_cmdline = [
           self.PathJoin('bin', 'run_%s' % target),
           '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
           '--target-devices-file', '${SWARMING_BOT_FILE}',
-          '-v'
-      ]
-      cmdline = (['./../../build/android/test_wrapper/logdog_wrapper.py']
-                 + logdog_command + test_cmdline)
+          '-v', '--upload-full-logcat', '${ISOLATED_OUTDIR}/logcats']
+      project = 'chromium'
+      output = 'logdog,service="services"'
+      coordinator_host = 'luci-logdog.appspot.com'
+      streamserver_uri = 'unix:/tmp/butler.sock'

[dnj, 2017/02/22 23:57:02]

This is a really generic name for this. You should do something to protect this
path from parallel or stale executions, and to limit it to the scope of your
specific execution.

@contextlib.contextmanager
def tempdir():
  tdir = tempfile.mkdtemp(prefix='tmp_android_mb')
  try:
    yield tdir
  finally:
    shutil.rmtree(tdir)

...

with tempdir() as tdir:
  streamserver_uri = 'unix:%s' % os.path.join(tdir, 'butler.sock')
  ...


---

this will create a unique directory for your execution, put the socket there,
and then clean it up afterwards.

[BigBossZhiling, 2017/02/27 19:43:17]

Done.

+      prefix = 'android/swarming/logcats/${SWARMING_TASK_ID}'
+
+      # Call test_cmdline through logdog butler subcommand.
+      cmdline = [
+          '../../bin/logdog_butler', '-project', project,
+          '-output', output,
+          '-prefix', prefix,
+          '-coordinator-host', coordinator_host,
+          'run', '-streamserver-uri', streamserver_uri, '--'] + test_cmdline

[dnj, 2017/02/22 23:57:02]

Break these like you did the above arguments.

[BigBossZhiling, 2017/02/27 19:43:17]

Done.

     elif use_xvfb and test_type == 'windowed_test_launcher':
       extra_files = [
           '../../testing/test_env.py',