Make it possible to have <object>'s scriptableObject as a v8 object instead of NPObject.

Make it possible to have <object>'s scriptableObject as a v8 object instead of NPObject.

It is well-known that Chromium is gradually deprecating NPAPI
with the goal of removing it completely by the end of 2014.
This is said to include NPObject class as well.

However, currently, for blink::WebPlugin implementators
(for <object> tag), it is only possible to return the corresponding
scriptable object (to back properties of the <object> tag
as visible from JavaScript) as an NPObject*.

This CL introduces the possibility to provide the plain v8 object,
instead. This lets the embedder to provide scripting facilities
for plugins (or whatever else provides <object> tags)
using v8 api or modern means like gin.

On top of it, the compatibility with current NPObject-based
features like nsplugins is kept
which simply can be removed once NPAPI is fully deprecated.

(This CL was originally at https://codereview.chromium.org/230813002/)

BUG=351636

[raymes, 2014-07-29 06:17:49]

I re-uploaded kolczyk@opera.com's CL here and rebased it. I'm happy for him to
land his if he wants to.

There is a working prototype of the chrome side change at:
https://codereview.chromium.org/400823004/. I'm in the process of breaking it up
and landing it (first part at https://codereview.chromium.org/421963008/)

[raymes, 2014-07-29 06:27:05]

On 2014/07/29 06:17:49, raymes wrote:
> I re-uploaded mailto:kolczyk@opera.com CL here and rebased it. I'm happy for
him to
> land his if he wants to.
> 
> There is a working prototype of the chrome side change at:
> https://codereview.chromium.org/400823004/. I'm in the process of breaking it
up
> and landing it (first part at https://codereview.chromium.org/421963008/)

It's probably also worth noting that I'm not very familiar with this (the blink
side) change. All I have done is rebase and re-upload, so please provide
guidance if it needs changes. The change appears to work as-is in my tests.

[Krzysztof Olczyk, 2014-07-29 06:38:36]

On 2014/07/29 06:27:05, raymes wrote:
> On 2014/07/29 06:17:49, raymes wrote:
> > I re-uploaded mailto:kolczyk@opera.com CL here and rebased it. I'm happy for
> him to
> > land his if he wants to.
> > 
> > There is a working prototype of the chrome side change at:
> > https://codereview.chromium.org/400823004/. I'm in the process of breaking
it
> up
> > and landing it (first part at https://codereview.chromium.org/421963008/)
> 
> It's probably also worth noting that I'm not very familiar with this (the
blink
> side) change. All I have done is rebase and re-upload, so please provide
> guidance if it needs changes. The change appears to work as-is in my tests.

Hi raymes,

thanks for the rebase, and checking it in other context (ppapi), finally, I
could not find
enough time to try it by myself.
I've fetched it to my original codereview at
https://codereview.chromium.org/230813002/.
I suggest we keep all patch sets and discussion there.

[raymes, 2014-07-29 06:41:49]

Great! Thanks for picking it up again. I'll close this issue. abarth@,jochen@
please continue the discussion on the original CL at
https://codereview.chromium.org/230813002/.