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

build/android/enable_asserts.py

Index: build/android/enable_asserts.py
diff --git a/build/android/enable_asserts.py b/build/android/enable_asserts.py
index 8fb7dca4725fe884af73115b0751d68d74f99940..b33e2120ae7c6cfcc09a57640b696f59f2810a8b 100755
--- a/build/android/enable_asserts.py
+++ b/build/android/enable_asserts.py
@@ -9,12 +9,15 @@
 import argparse
 import sys
 
+from pylib.device import device_blacklist
 from pylib.device import device_utils
 
 
 def main():
   parser = argparse.ArgumentParser()
 
+  parser.add_argument('--blacklist-file', help='Device blacklist JSON file.')
+
   set_asserts_group = parser.add_mutually_exclusive_group(required=True)
   set_asserts_group.add_argument(
       '--enable_asserts', dest='set_asserts', action='store_true',
@@ -25,9 +28,15 @@ def main():
 
   args = parser.parse_args()
 
+  if args.blacklist_file:
+    blacklist = device_blacklist.Blacklist(args.blacklist_file)
+  else:
+    blacklist = None
+
   # TODO(jbudorick): Accept optional serial number and run only for the
   # specified device when present.
-  devices = device_utils.DeviceUtils.parallel()
+  devices = device_utils.DeviceUtils.parallel(
+      device_utils.DeviceUtils.HealthyDevices(blacklist))
 
   def set_java_asserts_and_restart(device):
     if device.SetJavaAsserts(args.set_asserts):