Chromedriver remote test support

My team is writing remote webdriver tests for ChromeOS. This
requires two changes to the local chromedriver server script:
*Allowing remote connections
*Leaving the server running after the script completes

BUG=None
TEST=Started server on vm guest, ran webdriver tests from vm host.

Change-Id: I8d1562ca59ec6ad4fe5916f263630c705cfcfcff
Reviewed-on: https://chromium-review.googlesource.com/272535
Reviewed-by: Dan Shi <dshi@chromium.org>
Reviewed-by: David Abrahams <resetswitch@chromium.org>
Trybot-Ready: David Abrahams <resetswitch@chromium.org>
Commit-Queue: David Abrahams <resetswitch@chromium.org>
Tested-by: David Abrahams <resetswitch@chromium.org>
1 file changed