[Android] Better handle gtest crashes that generate pexpect.EOF.

build/android/pylib/android_commands.py

 # Copyright (c) 2012 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.
 
 """Provides an interface to communicate with the device via the adb command.
 
 Assumes adb binary is currently on system path.
 """
 
 import collections
@@ skipping 197 matching lines @@
     self._pushed_files = []
     self._device_utc_offset = self.RunShellCommand('date +%z')[0]
     self._md5sum_path = ''
     self._external_storage = ''
     self._util_wrapper = ''
 
   def Adb(self):
     """Returns our AdbInterface to avoid us wrapping all its methods."""
     return self._adb
 
+  def IsOnline(self):
+    """Checks whether the device is online.
+
+    Returns:
+      True if device is in 'device' mode, False otherwise.
+    """
+    out = self._adb.SendCommand('get-state')
+    return out.strip() == 'device'
+
   def IsRootEnabled(self):
     """Checks if root is enabled on the device."""
     root_test_output = self.RunShellCommand('ls /root') or ['']
     return not 'Permission denied' in root_test_output[0]
 
   def EnableAdbRoot(self):
     """Enables adb root on the device.
 
     Returns:
       True: if output from executing adb root was as expected.
@@ skipping 979 matching lines @@
   """
   def __init__(self, output):
     self._output = output
 
   def write(self, data):
     data = data.replace('\r\r\n', '\n')
     self._output.write(data)
 
   def flush(self):
     self._output.flush()