GN: Fix for chromeos building.

GN: Fix for chromeos building.

Tested with the following command lines:

$ gn gen --args='os="chromeos"' out_gn_chromeos/Debug

and

$ gn gen --args='os="android" cpu_arch="arm"' out_gn_android/Debug

See gn-dev mailing-list thread discussion:

https://groups.google.com/a/chromium.org/d/topic/gn-dev/Mq2ycNv4vRg/discussion

BUG=None
TEST=see above
R=brettw@chromium.org,eae@chromium.org

Committed: https://crrev.com/cd8452bc113fe8c6a1566b0c6ed5245a7a230e43
Cr-Commit-Position: refs/heads/master@{#311193}

[tfarina, 2015-01-13 02:04:51]

Patchset #2 (id:20001) has been deleted

[eae, 2015-01-13 02:10:08]

LGTM

[Dirk Pranke, 2015-01-13 02:17:43]

dpranke@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2015-01-13 02:17:44]

lgtm. make sure you run it through the chromeos gn bots, though, since they're
not run by default.

[brettw, 2015-01-13 02:20:56]

On 2015/01/13 02:17:44, Dirk Pranke wrote:
> lgtm. make sure you run it through the chromeos gn bots, though, since they're
> not run by default.

Can we turn these on by default? I've broken it a few times, and it means I
can't just click CQ: I have to do a full try run, and *then* click the CQ
checkbox once everything is green.

[brettw, 2015-01-13 02:23:19]

lgtm

[Dirk Pranke, 2015-01-13 02:28:03]

On 2015/01/13 02:20:56, brettw wrote:
> On 2015/01/13 02:17:44, Dirk Pranke wrote:
> > lgtm. make sure you run it through the chromeos gn bots, though, since
they're
> > not run by default.
> 
> Can we turn these on by default? I've broken it a few times, and it means I
> can't just click CQ: I have to do a full try run, and *then* click the CQ
> checkbox once everything is green.

Yeah, sorry, I started working on this right before the holidays, but then was
out on vacation and then sick (which I still am, a bit). I should get to many if
not all of the bots this week.

[tfarina, 2015-01-13 02:45:21]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-01-13 02:46:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/846073005/1

[commit-bot: I haz the power, 2015-01-13 02:52:13]

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

[commit-bot: I haz the power, 2015-01-13 02:52:15]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[tfarina, 2015-01-13 02:57:19]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-01-13 02:58:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/846073005/1

[commit-bot: I haz the power, 2015-01-13 03:08:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-13 03:10:14]

Patchset 1 (id:??) landed as
https://crrev.com/cd8452bc113fe8c6a1566b0c6ed5245a7a230e43
Cr-Commit-Position: refs/heads/master@{#311193}