Add missing include for sleep().

Add missing include for sleep().

This used to be leaked unconditionally by libc++.

Change-Id: I984ab7328ff3a2499c3c89a6862feaa62b6166de

Author: Dan Albert<danalbert@google.com>;

Cherry-pick of https://android-review.googlesource.com/#/c/178189/1

This fixes the AOSP mips build.

Committed: https://skia.googlesource.com/skia/+/27a58348b2a38bf8cca16dfd8f332d8cd5773270

[scroggo, 2015-10-28 15:25:40]

scroggo@google.com changed reviewers:
+ danalbert@google.com, mtklein@google.com

[mtklein, 2015-10-28 15:34:20]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-10-28 15:34:20]

lgtm

[commit-bot: I haz the power, 2015-10-28 15:34:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1425843003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1425843003/1

[commit-bot: I haz the power, 2015-10-28 15:36:39]

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

[commit-bot: I haz the power, 2015-10-28 15:36:39]

Try jobs failed on following builders:
  Build-Win-MSVC-x86_64-Debug-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Win-MSVC-x86_6...)

[mtklein, 2015-10-28 15:38:54]

Oh, duh, Windows doesn't have unistd.h  Let's move this after SkTypes.h and
guard with !defined(SK_BUILD_FOR_WIN32).

[scroggo, 2015-10-28 15:44:54]

On 2015/10/28 15:38:54, mtklein wrote:
> Oh, duh, Windows doesn't have unistd.h  Let's move this after SkTypes.h and
> guard with !defined(SK_BUILD_FOR_WIN32).

Done.

[scroggo, 2015-10-28 15:46:01]

The CQ bit was checked by scroggo@google.com

[scroggo, 2015-10-28 15:46:02]

The patchset sent to the CQ was uploaded after l-g-t-m from mtklein@google.com
Link to the patchset: https://codereview.chromium.org/1425843003/#ps20001
(title: "Not on windows")

[commit-bot: I haz the power, 2015-10-28 15:46:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1425843003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1425843003/20001

[commit-bot: I haz the power, 2015-10-28 15:56:44]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/27a58348b2a38bf8cca16dfd8f332d8cd5773270