Fix build/android/enable_asserts.py.

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 1823899aea99d5a07e7c4ddb676872617f5f07c6..9ed402e8a845b237558c289b2926e1c6a49f9ae4 100755
--- a/build/android/enable_asserts.py
+++ b/build/android/enable_asserts.py
@@ -6,6 +6,7 @@
 
 """Enables dalvik vm asserts in the android device."""
 
+from pylib import android_commands
 from pylib.device import device_utils
 import optparse
 import sys
@@ -21,10 +22,13 @@ def main(argv):
       help='Removes the dalvik.vm.enableassertions property')
   options, _ = option_parser.parse_args(argv)
 
-  device = device_utils.DeviceUtils()
-  if options.set_asserts != None:
-    if device.old_interface.SetJavaAssertsEnabled(options.set_asserts):
-      device.old_interface.Reboot(full_reboot=False)
+  # TODO(jbudorick): Accept optional serial number and run only for the
+  # specified device when present.
+  devices = android_commands.GetAttachedDevices()
+  for device in [device_utils.DeviceUtils(serial) for serial in devices]:
+    if options.set_asserts != None:
+      if device.old_interface.SetJavaAssertsEnabled(options.set_asserts):
+        device.old_interface.Reboot(full_reboot=False)
 
 
 if __name__ == '__main__':