[OSX] IMAGE_GRID macro for NinePartImage.

[OSX]  IMAGE_GRID macro for NinePartImage.

Mirrors Views' IMAGE_GRID macro, reducing boilerplate code.

BUG=none
R=rsesek@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251257

[groby-ooo-7-16, 2014-02-12 23:38:34]

-rsesek since OOO

avi: PTAL. And if you have a good idea where we could share this macro with
Views, I'd love to hear it.

[Avi (use Gerrit), 2014-02-13 16:19:31]

LGTM

I don't know enough about Views to comment on reuse.

[groby-ooo-7-16, 2014-02-13 20:06:58]

The CQ bit was checked by groby@chromium.org

[commit-bot: I haz the power, 2014-02-13 20:13:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/groby@chromium.org/160253005/1

[commit-bot: I haz the power, 2014-02-13 21:39:00]

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

[commit-bot: I haz the power, 2014-02-13 21:39:03]

Retried try job too often on win_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[Paweł Hajdan Jr., 2014-02-13 22:24:52]

The CQ bit was checked by phajdan.jr@chromium.org

[commit-bot: I haz the power, 2014-02-13 22:27:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/groby@chromium.org/160253005/1

[commit-bot: I haz the power, 2014-02-14 01:33:40]

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

[commit-bot: I haz the power, 2014-02-14 01:33:41]

Retried try job too often on linux_chromeos for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[groby-ooo-7-16, 2014-02-14 01:55:11]

The CQ bit was checked by groby@chromium.org

[commit-bot: I haz the power, 2014-02-14 01:56:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/groby@chromium.org/160253005/1

[commit-bot: I haz the power, 2014-02-14 04:21:22]

Change committed as 251257

[Robert Sesek, 2014-02-24 14:02:09]

ex post facto lgtm

This is way nicer than the array. I can't think of a place where both Cocoa and
Views could share this (and I don't think it deserves its own file). Because the
Cocoa 9-patch drawing function uses AppKit types in the signature, it can't go
into a header that's included by .cc files (like nine_image_painter.h). Oh well,
it's not that much code.