Exposing document.createElement

Exposing document.createElement

As part of removing all $dom_ APIs, making this one public. There are valid scenarios for creating elements in other documents.

BUG=
R=efortuna@google.com

Committed: https://code.google.com/p/dart/source/detail?r=27415

[Emily Fortuna, 2013-09-11 19:46:09]

I thought this was part of a larger change? ;-) 
Or what about making this part of the constructors instead?

[blois, 2013-09-11 19:54:27]

On 2013/09/11 19:46:09, Emily Fortuna wrote:
> I thought this was part of a larger change? ;-) 
> Or what about making this part of the constructors instead?

The tagExtension portion of this went in on Monday, so document.createElement
takes two parameters. I had just left renaming of this off to keep the previous
change manageable.

Document.createElement is still the underlying API that I don't think should or
could be merged into the constructors because there are valid scenarios for
multiple document support and I think this is too complex to push into the
element constructors.

[Emily Fortuna, 2013-09-11 19:57:54]

alrighty. lgtm.

[blois, 2013-09-12 00:00:52]

Committed patchset #1 manually as r27415 (presubmit successful).