[Android] Detect when remote service loses contact with device.

build/android/pylib/remote/device/remote_device_test_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.
 
 """Run specific test on specific environment."""
 
 import json
 import logging
 import os
+import re
 import shutil
 import string
 import tempfile
 import time
 import zipfile
 
 from pylib.base import test_run
 from pylib.remote.device import appurify_constants
 from pylib.remote.device import appurify_sanitized
 from pylib.remote.device import remote_device_helper
 from pylib.utils import zip_utils
 
+_DEVICE_OFFLINE_RE = re.compile('error: device not found')
+
+
 class RemoteDeviceTestRun(test_run.TestRun):
   """Run tests on a remote device."""
 
   _TEST_RUN_KEY = 'test_run'
   _TEST_RUN_ID_KEY = 'test_run_id'
 
   WAIT_TIME = 5
   COMPLETE = 'complete'
   HEARTBEAT_INTERVAL = 300
 
@@ skipping 301 matching lines @@
     """
     zip_file = self._DownloadTestResults(None)
     with zipfile.ZipFile(zip_file) as z:
       try:
         logcat = z.read('appurify_results/logcat.txt')
         printable_logcat = ''.join(c for c in logcat if c in string.printable)
         for line in printable_logcat.splitlines():
           logging.log(level, line)
       except KeyError:
         logging.error('No logcat found.')
+
+  def _LogAdbTraceLog(self):
+    zip_file = self._DownloadTestResults(None)
+    with zipfile.ZipFile(zip_file) as z:
+      adb_trace_log = z.read('adb_trace.log')
+      for line in adb_trace_log.splitlines():
+        logging.critical(line)
+
+  def _DidDeviceGoOffline(self):
+    zip_file = self._DownloadTestResults(None)
+    with zipfile.ZipFile(zip_file) as z:
+      adb_trace_log = z.read('adb_trace.log')
+      if any(_DEVICE_OFFLINE_RE.search(l) for l in adb_trace_log.splitlines()):
+        return True
+    return False