Make GN --as=output relative to the root build directory.

Make GN --as=output relative to the root build directory.

The intended use for this parameter is to give files that can be passed to Ninja to compile. Ninja takes files relative to the root build directory.

BUG=546127
Committed: https://crrev.com/1c010e5f6ccb6b5d65044500fb1f656d3f8b5d6b
Cr-Commit-Position: refs/heads/master@{#355555}

[brettw, 2015-10-22 04:27:02]

brettw@chromium.org changed reviewers:
+ aizatsky@chromium.org

[brettw, 2015-10-22 04:27:06]

The CQ bit was checked by brettw@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-22 04:27:10]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413573006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413573006/1

[commit-bot: I haz the power, 2015-10-22 04:39:08]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-22 04:39:09]

Dry run: This issue passed the CQ dry run.

[aizatsky, 2015-10-22 16:49:33]

The CQ bit was checked by aizatsky@chromium.org

[aizatsky, 2015-10-22 16:49:33]

lgtm

Thanks for fixing this.

[commit-bot: I haz the power, 2015-10-22 16:50:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413573006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413573006/1

[commit-bot: I haz the power, 2015-10-22 16:54:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-22 16:54:53]

Patchset 1 (id:??) landed as
https://crrev.com/1c010e5f6ccb6b5d65044500fb1f656d3f8b5d6b
Cr-Commit-Position: refs/heads/master@{#355555}