Register existing chrome junit tests in GN

Register existing chrome junit tests in GN

On GYP builds, chrome_junit_tests was building and running tests for
media.remote, but GN builds didn't do that. This patch does the
manual addition required for it with GN

BUG=472067
Committed: https://crrev.com/5d8fd2c204e51799c26bb468aba4644b65a090b7
Cr-Commit-Position: refs/heads/master@{#326816}

[dgn, 2015-04-24 15:51:14]

dgn@chromium.org changed reviewers:
+ bauerb@chromium.org

[dgn, 2015-04-24 15:51:15]

PTAL. It just adds some test files and a required dependency to GN

[Bernhard Bauer, 2015-04-24 15:55:56]

Nice, LGTM!

[dgn, 2015-04-24 15:56:26]

The CQ bit was checked by dgn@chromium.org

[commit-bot: I haz the power, 2015-04-24 15:57:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1099713004/1

[commit-bot: I haz the power, 2015-04-24 16:26:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-24 16:27:39]

Patchset 1 (id:??) landed as
https://crrev.com/5d8fd2c204e51799c26bb468aba4644b65a090b7
Cr-Commit-Position: refs/heads/master@{#326816}