mac: Back discardable shared memory with a Mach primitive.

mac: Back discardable shared memory with a Mach primitive.

Discardable shared memory no longer relies on a POSIX fd backed shared memory
region, as it no longer uses ftruncate.

BUG=547239
Committed: https://crrev.com/9eb16f685f80cac468928277c6ccbd91ca373b0e
Cr-Commit-Position: refs/heads/master@{#363045}

[erikchen, 2015-12-03 18:46:28]

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

[commit-bot: I haz the power, 2015-12-03 18:46:54]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1497843002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1497843002/1

[erikchen, 2015-12-03 18:48:08]

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

[erikchen, 2015-12-03 18:48:08]

mark: Please review.

[Mark Mentovai, 2015-12-03 18:57:49]

LGTM

[commit-bot: I haz the power, 2015-12-03 20:06:52]

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

[commit-bot: I haz the power, 2015-12-03 20:06:53]

Dry run: This issue passed the CQ dry run.

[erikchen, 2015-12-03 20:18:24]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-12-03 20:19:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1497843002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1497843002/1

[commit-bot: I haz the power, 2015-12-03 20:27:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-03 20:28:23]

Description was changed from

==========
mac: Back discardable shared memory with a Mach primitive.

Discardable shared memory no longer relies on a POSIX fd backed shared memory
region, as it no longer uses ftruncate.

BUG=547239
==========

to

==========
mac: Back discardable shared memory with a Mach primitive.

Discardable shared memory no longer relies on a POSIX fd backed shared memory
region, as it no longer uses ftruncate.

BUG=547239

Committed: https://crrev.com/9eb16f685f80cac468928277c6ccbd91ca373b0e
Cr-Commit-Position: refs/heads/master@{#363045}
==========

[commit-bot: I haz the power, 2015-12-03 20:28:24]

Patchset 1 (id:??) landed as
https://crrev.com/9eb16f685f80cac468928277c6ccbd91ca373b0e
Cr-Commit-Position: refs/heads/master@{#363045}