Isolate courgette_unittests

Adding link to http://www.chromium.org/developers/testing/isolated-testing/for-swes for my future self.

R=maruel@chromium.org,jochen@chromium.org
TBR=jam@chromium.org
BUG=98637, 450912

Committed: https://crrev.com/c9bd3b9a5667a36c05592ec9d16533be91b4567c
Cr-Commit-Position: refs/heads/master@{#312531}

Review URL: https://codereview.chromium.org/868433002

Cr-Commit-Position: refs/heads/master@{#312665}
5 files changed