Add iOS support to mac_toolchain download script.

Add iOS support to mac_toolchain download script.

Pull a different toolchain for target_os = iOS builds.

BUG=669094
Committed: https://crrev.com/abbd93dcb51b18b634ff73853df13e8e5aec0d93
Cr-Commit-Position: refs/heads/master@{#435393}

[justincohen, 2016-11-30 01:38:10]

justincohen@chromium.org changed reviewers:
+ erikchen@chromium.org

[justincohen, 2016-11-30 01:38:10]

ptal

https://codereview.chromium.org/2540783003/diff/1/build/mac_toolchain.py
File build/mac_toolchain.py (right):

https://codereview.chromium.org/2540783003/diff/1/build/mac_toolchain.py#newc...
build/mac_toolchain.py:203: toolchain_version =
os.environ.get('MAC_TOOLCHAIN_REVISION',
With GN do we need to get rid of this?  I'm not sure how this works in GN-land,
can we still use environ?  We should probably rename this to TOOLCHAIN_REVISION
if no one is using it.

[justincohen, 2016-11-30 18:56:16]

Now with latest iOS package.

[erikchen, 2016-11-30 19:00:34]

lgtm

[justincohen, 2016-11-30 19:01:06]

The CQ bit was checked by justincohen@chromium.org

[commit-bot: I haz the power, 2016-11-30 19:02:07]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-30 20:11:31]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1480532466099490,
"parent_rev": "bbff898041b6e438a6d4a429e5d8d9278f0cfe22", "commit_rev":
"f5ba0e6e418197be0e693b4f281feca8a3d13528"}

[commit-bot: I haz the power, 2016-11-30 20:13:11]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1480532466099490,
"parent_rev": "bbff898041b6e438a6d4a429e5d8d9278f0cfe22", "commit_rev":
"f5ba0e6e418197be0e693b4f281feca8a3d13528"}

[commit-bot: I haz the power, 2016-11-30 20:13:37]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-30 20:16:50]

Description was changed from

==========
Add iOS support to mac_toolchain download script.

Pull a different toolchain for target_os = iOS builds.

BUG=669094
==========

to

==========
Add iOS support to mac_toolchain download script.

Pull a different toolchain for target_os = iOS builds.

BUG=669094

Committed: https://crrev.com/abbd93dcb51b18b634ff73853df13e8e5aec0d93
Cr-Commit-Position: refs/heads/master@{#435393}
==========

[commit-bot: I haz the power, 2016-11-30 20:16:51]

Patchset 2 (id:??) landed as
https://crrev.com/abbd93dcb51b18b634ff73853df13e8e5aec0d93
Cr-Commit-Position: refs/heads/master@{#435393}