GN: support cc_wrapper on Mac

GN: support cc_wrapper on Mac

Seems maybe the original CL just overlooked build/toolchain/mac/BUILD.gn?
(https://codereview.chromium.org/1660053005)

BUG=

Committed: https://crrev.com/c56a9a3bbf9e905cc17a8d2c6e890e7a0ceb7cbb
Cr-Commit-Position: refs/heads/master@{#401018}

[mtklein_C, 2016-06-21 13:05:40]

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

[commit-bot: I haz the power, 2016-06-21 13:05:58]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2087793002/1

[mtklein_C, 2016-06-21 13:11:47]

The CQ bit was unchecked by mtklein@chromium.org

[mtklein_C, 2016-06-21 13:12:48]

mtklein@chromium.org changed reviewers:
+ brettw@chromium.org, dpranke@chromium.org

[Dirk Pranke, 2016-06-21 16:35:49]

lgtm

[mtklein_C, 2016-06-21 16:52:46]

The CQ bit was checked by mtklein@chromium.org

[commit-bot: I haz the power, 2016-06-21 16:53:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2087793002/1

[commit-bot: I haz the power, 2016-06-21 16:58:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-21 17:00:18]

Description was changed from

==========
GN: support cc_wrapper on Mac

Seems maybe the original CL just overlooked build/toolchain/mac/BUILD.gn?
(https://codereview.chromium.org/1660053005)

BUG=
==========

to

==========
GN: support cc_wrapper on Mac

Seems maybe the original CL just overlooked build/toolchain/mac/BUILD.gn?
(https://codereview.chromium.org/1660053005)

BUG=

Committed: https://crrev.com/c56a9a3bbf9e905cc17a8d2c6e890e7a0ceb7cbb
Cr-Commit-Position: refs/heads/master@{#401018}
==========

[commit-bot: I haz the power, 2016-06-21 17:00:19]

Patchset 1 (id:??) landed as
https://crrev.com/c56a9a3bbf9e905cc17a8d2c6e890e7a0ceb7cbb
Cr-Commit-Position: refs/heads/master@{#401018}