Allow NEON on iOS.

Allow NEON on iOS.

I have nanobench building and running (Color32_arm_neon) on my iPad.

No public API changes.
TBR=reed@google.com

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/e5043b7ea5170a639367b67c986568907576be4b

[mtklein, 2015-04-16 19:55:57]

mtklein@google.com changed reviewers:
+ caryclark@google.com, mtklein@google.com

[caryclark, 2015-04-16 19:58:01]

lgtm

[mtklein, 2015-04-16 20:00:20]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-04-16 20:00:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1091823002/40001

[commit-bot: I haz the power, 2015-04-16 20:07:37]

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

[commit-bot: I haz the power, 2015-04-16 20:07:38]

Try jobs failed on following builders:
  Build-Mac10.7-Clang-Arm7-Debug-iOS-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Mac10.7-Clang-...)

[mtklein, 2015-04-17 13:36:35]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-04-17 13:36:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1091823002/40001

[commit-bot: I haz the power, 2015-04-17 13:36:56]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/e5043b7ea5170a639367b67c986568907576be4b

[mtklein, 2015-04-17 21:02:07]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/1094843005/ by mtklein@google.com.

The reason for reverting is: need to coordinate this with chrome gyps/gn.

[mtklein, 2015-04-20 13:06:00]

On 2015/04/17 21:02:07, mtklein wrote:
> A revert of this CL (patchset #3 id:40001) has been created in
> https://codereview.chromium.org/1094843005/ by mailto:mtklein@google.com.
> 
> The reason for reverting is: need to coordinate this with chrome gyps/gn.

http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...