Introduce EditingStyleUtilities.{cpp,h}

Introduce EditingStyleUtilities.{cpp,h}

EditingStyle is used to deal with CSS styles in editing. but it has
many static methods to create an EditingStyle and some of the methods
don't access member variables so they can be split into
EditingStyleUtilities class.

BUG=679817

[joone, 2017-01-13 23:55:03]

The CQ bit was checked by joone.hur@intel.com to run a CQ dry run

[commit-bot: I haz the power, 2017-01-13 23:55:47]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[joone, 2017-01-19 01:32:24]

The CQ bit was checked by joone.hur@intel.com to run a CQ dry run

[commit-bot: I haz the power, 2017-01-19 01:33:46]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[joone, 2017-01-19 01:34:32]

Patchset #3 (id:40001) has been deleted

[joone, 2017-01-19 01:36:49]

The CQ bit was checked by joone.hur@intel.com to run a CQ dry run

[commit-bot: I haz the power, 2017-01-19 01:37:13]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-19 03:50:22]

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

[commit-bot: I haz the power, 2017-01-19 03:50:23]

Dry run: This issue passed the CQ dry run.

[joone, 2017-01-19 04:54:43]

joone.hur@intel.com changed reviewers:
+ yosin@chromium.org

[joone, 2017-01-19 04:54:43]

Hi yosin@ could you review this CL?

[yosin_UTC9, 2017-01-19 05:52:17]

For ease of history tracking and reviewing, could you split this patch into
1. Copy EditingStyle.{cpp,h} to EditingStyleUtilities.{cpp,h}
 - adjust include guard 
 - enclosing code by EditingStyleUtilities.{cpp,h}
2. Finish EditingStyleUtitilies.{cpp,h} + BUILD.gn
3. Rename call sites to |EditingStyleUtilitis::|
4. Get rid of moved functions from EdigintStyle.{cpp,h}

Thanks for your cooperation.

[joone, 2017-01-20 18:17:18]

Description was changed from

==========
Introduce EditingStyleUtilities.{cpp,h}

EditingStyle is used to deal with CSS styles in editing. but it has
many static methods to create a EditingStyle and some of the methods
don't access member variables so they can be split into
EditingStyleUtilities class.

BUG=679817
==========

to

==========
Introduce EditingStyleUtilities.{cpp,h}

EditingStyle is used to deal with CSS styles in editing. but it has
many static methods to create an EditingStyle and some of the methods
don't access member variables so they can be split into
EditingStyleUtilities class.

BUG=679817
==========