[Bindings] Declare signature and executionContext once

Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Plus, in the details, two macros created executionContext
from literally different v8::Context's, but they are actually
same in the call sites.
Hence we need one signature and one executionContext.


BUG=690714
Review-Url: https://codereview.chromium.org/2692343006
Cr-Commit-Position: refs/heads/master@{#450960}
Committed: https://chromium.googlesource.com/chromium/src/+/2df25dd0beaa6ff0750ad1bae330e3d9ff84a9c0

[peria, 2017-02-16 09:18:26]

Description was changed from

==========
unify declarations of signature and executioncontext

BUG=690714
==========

to

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Fortunately, we have no such IDLs at the moment, but
this CL enables to do it for future updates.


BUG=690714
==========

[peria, 2017-02-16 09:20:57]

peria@chromium.org changed reviewers:
+ bashi@chromium.org, haraken@chromium.org, yukishiino@chromium.org

[peria, 2017-02-16 09:20:58]

PTL

[haraken, 2017-02-16 09:22:04]

LGTM

[peria, 2017-02-16 09:37:47]

The CQ bit was checked by peria@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-02-16 09:38:38]

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

[peria, 2017-02-16 09:40:41]

Description was changed from

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Fortunately, we have no such IDLs at the moment, but
this CL enables to do it for future updates.


BUG=690714
==========

to

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Plus, in the details, both macro creates executionContext
from literally different v8::Context, but they are actually
same in the call sites.
Hence we need one signature and one executionContext.


BUG=690714
==========

[peria, 2017-02-16 09:41:24]

Description was changed from

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Plus, in the details, both macro creates executionContext
from literally different v8::Context, but they are actually
same in the call sites.
Hence we need one signature and one executionContext.


BUG=690714
==========

to

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Plus, in the details, two macros created executionContext
from literally different v8::Context's, but they are actually
same in the call sites.
Hence we need one signature and one executionContext.


BUG=690714
==========

[Yuki, 2017-02-16 10:21:30]

LGTM.

[peria, 2017-02-16 10:39:41]

The CQ bit was unchecked by peria@chromium.org

[peria, 2017-02-16 10:39:41]

The CQ bit was checked by peria@chromium.org

[commit-bot: I haz the power, 2017-02-16 10:39:54]

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, 2017-02-16 14:45:02]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1487241581602080,
"parent_rev": "9b5580df750abd8c3354d7c63e8a7d38c479ea39", "commit_rev":
"2df25dd0beaa6ff0750ad1bae330e3d9ff84a9c0"}

[commit-bot: I haz the power, 2017-02-16 14:45:44]

Description was changed from

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Plus, in the details, two macros created executionContext
from literally different v8::Context's, but they are actually
same in the call sites.
Hence we need one signature and one executionContext.


BUG=690714
==========

to

==========
Declare signature and executionContext once in a method
preparePrototypeAndInterfaceObject().

If we want to install conditional attributes and methods
in a (partial) interface, we declared them independently
and had compile errors.
Plus, in the details, two macros created executionContext
from literally different v8::Context's, but they are actually
same in the call sites.
Hence we need one signature and one executionContext.


BUG=690714

Review-Url: https://codereview.chromium.org/2692343006
Cr-Commit-Position: refs/heads/master@{#450960}
Committed:
https://chromium.googlesource.com/chromium/src/+/2df25dd0beaa6ff0750ad1bae330...
==========

[commit-bot: I haz the power, 2017-02-16 14:45:46]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/2df25dd0beaa6ff0750ad1bae330...