ChromeDriver has pre-installed APK's, thus should not wipe during provisioning.

build/android/buildbot/bb_device_steps.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 import collections
 import glob
 import hashlib
 import json
 import os
@@ skipping 394 matching lines @@
 def ProvisionDevices(options):
   bb_annotations.PrintNamedStep('provision_devices')
 
   if not bb_utils.TESTING:
     # Restart adb to work around bugs, sleep to wait for usb discovery.
     device_utils.RestartServer()
     RunCmd(['sleep', '1'])
   provision_cmd = ['build/android/provision_devices.py', '-t', options.target]
   if options.auto_reconnect:
     provision_cmd.append('--auto-reconnect')
+  if options.skip_wipe:
+    provision_cmd.append('--skip-wipe')
   RunCmd(provision_cmd)
 
 
 def DeviceStatusCheck(options):
   bb_annotations.PrintNamedStep('device_status_check')
   cmd = ['build/android/buildbot/bb_device_status_check.py']
   if options.restart_usb:
     cmd.append('--restart-usb')
   RunCmd(cmd, halt_on_failure=True)
 
@@ skipping 215 matching lines @@
                           'only run if this is set.'))
   parser.add_option('--restart-usb', action='store_true',
                     help='Restart usb ports before device status check.')
   parser.add_option(
       '--flakiness-server',
       help=('The flakiness dashboard server to which the results should be '
             'uploaded.'))
   parser.add_option(
       '--auto-reconnect', action='store_true',
       help='Push script to device which restarts adbd on disconnections.')
+  parser.add_option('--skip-wipe', action='store_true',
+                    help='Do not wipe devices during provisioning.')
   parser.add_option(
       '--logcat-dump-output',
       help='The logcat dump output will be "tee"-ed into this file')
   # During processing perf bisects, a seperate working directory created under
   # which builds are produced. Therefore we should look for relevent output
   # file under this directory.(/b/build/slave/<slave_name>/build/bisect/src/out)
   parser.add_option(
       '--chrome-output-dir',
       help='Chrome output directory to be used while bisecting.')
 
@@ skipping 25 matching lines @@
 
   if options.coverage_bucket:
     setattr(options, 'coverage_dir',
             os.path.join(CHROME_OUT_DIR, options.target, 'coverage'))
 
   MainTestWrapper(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))