Add ChromiumOS Linux to flakiness dash.
Add ChromiumOS Linux to flakiness dash.

This bot will be even more useful if we can track the test results
via the flakiness dash.

BUG=
TESTED=make start, looked at log output for errors


Review URL: https://chromiumcodereview.appspot.com/12871021

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@190704 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build