tree 3a8eebcfd3f161d4560e705082dfe2c986691e48
parent 15bb40a58b17a639e59100479cf4ba3e6775c5e1
author destradaa <destradaa@google.com> 1438042443 -0700
committer destradaa <destradaa@google.com> 1438042443 -0700

Fix NPE in AR hardware binding sequence.
b/22772433

To keep the old Watcher binding sequence backwards compatible,
it is required to ensure that the callback is only invoked if
the feature is supported by the platform, and an instance is
available.

Change-Id: I0a6335f10647184abdad3ee1583b505160a3308f