Move the test template to //testing/test.gni (part 1)

Move the test template to //testing/test.gni (part 1)

This is the first CL to move the test template to //testing/test.gni

This CL is just creating an empty test.gni file. It is needed because
the test template is used in Blink, so we need to makes this change in
stages.

R=cjhopman@chromium.org

Committed: https://crrev.com/c6c612cc34b18dbce1ba479419601744cec7c699
Cr-Commit-Position: refs/heads/master@{#311341}

[cjhopman, 2015-01-13 21:12:31]

lgtm

[qsr, 2015-01-13 21:12:57]

The CQ bit was checked by qsr@chromium.org

[qsr, 2015-01-13 21:13:08]

The CQ bit was unchecked by qsr@chromium.org

[qsr, 2015-01-13 21:13:19]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2015-01-13 21:13:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/850743003/1

[commit-bot: I haz the power, 2015-01-13 22:08:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-13 22:09:14]

Patchset 1 (id:??) landed as
https://crrev.com/c6c612cc34b18dbce1ba479419601744cec7c699
Cr-Commit-Position: refs/heads/master@{#311341}