IDL: Support [NewObject] and [SameObject] extended attributes

IDL: Support [NewObject] and [SameObject] extended attributes

This patch only adds the names to the list of allowed extended attribute,
so that having them in the IDL doesn't cause compilation errors.

Using them has no effect on the generated code; we're allowing them so
that IDL files can use the same syntax as specifications.

BUG=462913
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191621

[Jens Widell, 2015-03-09 11:56:35]

jl@opera.com changed reviewers:
+ haraken@chromium.org

[Jens Widell, 2015-03-09 11:56:35]

PTAL

I think implementing these as no-ops is the most reasonable approach.

[haraken, 2015-03-09 23:26:42]

I'm wondering what the [NewObject] and [SameObject] are for. Is the Web IDL spec
intending to add [NewObject] or [SameObject] for almost all attributes/methods?
How is it helpful (just for annotating purpose)?

[Jens Widell, 2015-03-10 07:17:51]

On 2015/03/09 23:26:42, haraken wrote:
> I'm wondering what the [NewObject] and [SameObject] are for. Is the Web IDL
spec
> intending to add [NewObject] or [SameObject] for almost all
attributes/methods?
> How is it helpful (just for annotating purpose)?

I don't think they're very meaningful, personally.

They're somewhat limited: [SameObject] is only to be used on readonly
attributes, and [NewObject] only on operations (that always return new objects).
But why these particular aspects of attributes and operations can't simply be
described in the prose I don't know.

[haraken, 2015-03-10 11:13:15]

LGTM, because [NewObject] and [SameObject] are speced.

(IMHO, [NewObject] and [SameObject] are not that meaningful and thus could be
removed from the spec though...)

[Jens Widell, 2015-03-10 11:14:15]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2015-03-10 11:19:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/993543003/1

[commit-bot: I haz the power, 2015-03-10 12:32:37]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=191621