Dynamic port detection for Aardvark tests Automatic port detection is added to RemoteAardvarkTouchDevice. BUG=none TEST=Manual test Change-Id: I083c94d42228394334c634128942d785b46d49e8 Reviewed-on: https://chromium-review.googlesource.com/287514 Reviewed-by: Charlie Mooney <[email protected]> Tested-by: Amirhossein Simjour <[email protected]> Commit-Queue: Amirhossein Simjour <[email protected]>