Add a new configuration 'Profile' when building for iOS

Add a new configuration 'Profile' when building for iOS

When running Instruments, it is better to use a Release build, but
with a dSYM file. So introduce a new configuration 'Profile' based
on 'Release' that also generates a dSYM file.

This uses a separate configuration because Instruments needs a
real dSYM file, and generating it with dsymutil is slow. Moreover,
it is not possible to build a dSYM file from the Release build, and
profiling a Debug build is not really representative of real usage.

BUG=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=253444

[sdefresne, 2014-02-25 14:23:44]

Please take a look.

[lliabraa, 2014-02-25 15:33:21]

lgtm

[blundell, 2014-02-25 15:38:30]

LGTM

[sdefresne, 2014-02-25 17:33:45]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2014-02-25 17:34:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sdefresne@chromium.org/179933002/1

[commit-bot: I haz the power, 2014-02-25 21:48:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sdefresne@chromium.org/179933002/1

[commit-bot: I haz the power, 2014-02-25 22:13:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sdefresne@chromium.org/179933002/1

[commit-bot: I haz the power, 2014-02-25 23:17:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sdefresne@chromium.org/179933002/1

[commit-bot: I haz the power, 2014-02-26 00:04:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sdefresne@chromium.org/179933002/1

[Paweł Hajdan Jr., 2014-02-26 05:34:20]

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

[commit-bot: I haz the power, 2014-02-26 05:34:50]

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

[Paweł Hajdan Jr., 2014-02-26 05:42:36]

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

[commit-bot: I haz the power, 2014-02-26 05:51:19]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sdefresne@chromium.org/179933002/1

[commit-bot: I haz the power, 2014-02-26 14:33:00]

Change committed as 253444