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

build/android/pylib/remote/device/remote_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.
 
 """Run specific test on specific environment."""
 
 import logging
 import os
 import re
 import tempfile
@@ skipping 64 matching lines @@
     if self._env.only_output_failures:
       logging.info('See logcat for more results information.')
     if not self._results['results']['pass']:
       if any(_NATIVE_CRASH_RE.search(l)
           for l in self._results['results']['output'].splitlines()):
         logging.critical('Native crash detected. Printing Logcat.')
         self._LogLogcat()
         results.AddResult(base_test_result.BaseTestResult(
             'Remote Service detected native crash.',
             base_test_result.ResultType.CRASH))
+      elif self._DidDeviceGoOffline():
+        self._LogLogcat()

[jbudorick, 2015/08/10 18:07:05]

Again, I think we want to get to a state where we have a failed amp step look
like this on a bot:

  [collect] my_test_suite
    1. stdio
    2. logcat
    3. adb_trace.log

+        self._LogAdbTraceLog()
+        raise remote_device_helper.RemoteDeviceError(
+            'Remote service unable to reach device.', is_infra_error=True)
       else:
         results.AddResult(base_test_result.BaseTestResult(
             'Remote Service detected error.',
             base_test_result.ResultType.UNKNOWN))
 
     return results