[Android] Add --blacklist-file as a command-line option.

build/android/adb_reverse_forwarder.py

Index: build/android/adb_reverse_forwarder.py
diff --git a/build/android/adb_reverse_forwarder.py b/build/android/adb_reverse_forwarder.py
index 3ce53595dae9f0657e0ef17f54a528305ba3464d..a3bfaf0b1a46454ca02c15db88dfc0e940833d08 100755
--- a/build/android/adb_reverse_forwarder.py
+++ b/build/android/adb_reverse_forwarder.py
@@ -19,6 +19,7 @@ import time
 from pylib import constants
 from pylib import forwarder
 from pylib.device import adb_wrapper
+from pylib.device import device_blacklist
 from pylib.device import device_errors
 from pylib.device import device_utils
 from pylib.utils import run_tests_helper
@@ -36,6 +37,7 @@ def main(argv):
                     help='Verbose level (multiple times for more)')
   parser.add_option('--device',
                     help='Serial number of device we should use.')
+  parser.add_option('--blacklist-file', help='Device blacklist JSON file.')
   parser.add_option('--debug', action='store_const', const='Debug',
                     dest='build_type', default='Release',
                     help='Use Debug build of host tools instead of Release.')
@@ -54,7 +56,12 @@ def main(argv):
     parser.error('Bad port number')
     sys.exit(1)
 
-  devices = device_utils.DeviceUtils.HealthyDevices()
+  if options.blacklist_file:
+    blacklist = device_blacklist.Blacklist(options.blacklist_file)
+  else:
+    blacklist = None
+
+  devices = device_utils.DeviceUtils.HealthyDevices(blacklist)
 
   if options.device:
     device = next((d for d in devices if d == options.device), None)