[Android] Tune DeviceUtils commands that are prone to large outputs.

build/android/pylib/device/device_errors.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.
 
 """
 Exception classes raised by AdbWrapper and DeviceUtils.
 """
 
 from pylib import cmd_helper
 from pylib.utils import base_error
@@ skipping 41 matching lines @@
 class AdbShellCommandFailedError(AdbCommandFailedError):
   """Exception for shell command failures run via adb."""
 
   def __init__(self, command, output, status, device_serial=None):
     self.command = command
     message = ['shell command run via adb failed on the device:\n',
                '  command: %s\n' % command]
     message.append('  exit status: %s\n' % status)
     if output:
       message.append('  output:\n')
-      message.extend('  - %s\n' % line for line in output.splitlines())
+      if isinstance(output, basestring):
+        output_lines = output.splitlines()
+      else:
+        output_lines = output
+      message.extend('  - %s\n' % line for line in output_lines)
     else:
       message.append("  output: ''\n")
     message = ''.join(message)
     super(AdbShellCommandFailedError, self).__init__(
       ['shell', command], output, status, device_serial, message)
 
 
 class CommandTimeoutError(base_error.BaseError):
   """Exception for command timeouts."""
   pass
 
 
 class DeviceUnreachableError(base_error.BaseError):
   """Exception for device unreachable failures."""
   pass
 
 
 class NoDevicesError(base_error.BaseError):
   """Exception for having no devices attached."""
 
   def __init__(self):
     super(NoDevicesError, self).__init__('No devices attached.')