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Watching for new hid devices is racy because the hidraw device rules are
still running. Fix the race by explicitly waiting for the hidraw device
add event. The properties needed from the hid device can be gotten by
fetching the parent of the hidraw device from the sysfs tree.

BUG=394200

Review URL: https://codereview.chromium.org/396993010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283810 0039d316-1c4b-4281-b951-d872f2087c98