Dawn: use Dawn's temporary test targets for isolates.

The plan is to move the actual test targets in Dawn to Dawn's
src/test directory. This change makes Chrome temporarily point at
some intermediate proxy targets, so we can move the real ones
without breaking Chrome.

Bug: dawn:61
Change-Id: I166c17f1689e2a2e71b1607af44f6f9a8c14b6af
Reviewed-on: https://chromium-review.googlesource.com/c/1372709
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Stephen White <senorblanco@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615715}
1 file changed