system_api: add kLinkUpProperty to shill

Ethernet.LinkUp will be exposed by Ethernet devices in shill to indicate
whether or not they have an underlying physical link.

BUG=chrome-os-partner:36917
TEST=emerge-amd64-generic system_api

Change-Id: Ic9399edf2b6336f143d1e3739c48e605406969bd
Reviewed-on: https://chromium-review.googlesource.com/251466
Trybot-Ready: Garret Kelly <gdk@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Garret Kelly <gdk@chromium.org>
Tested-by: Garret Kelly <gdk@chromium.org>
1 file changed
tree: 9a324a8cf2051a503104d124e7ab0a02fe82a4ca
  1. constants/
  2. dbus/
  3. switches/
  4. OWNERS
  5. README
  6. system_api.gyp
  7. system_api.pc