Add jobs for Samsung Chromebook XE303C12

Bug: skia:6507
NOTRY=true
Change-Id: I957a72d496ff521972fbc505fcb85cb30c019a93
Reviewed-on: https://skia-review.googlesource.com/13477
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
3 files changed