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Adds in the dimension set, to make sure we run on our bot. Also fixes
the compile target, which might fix Linux Builder not generating the
proper isolate.

NOTRY=true

Bug: 758630
Change-Id: I1f837b1c8854bce0de1bee9c4abd2103aefb661a
Reviewed-on: https://chromium-review.googlesource.com/688217
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#504865}