Mojo C++ bindings: support sync methods - part 1.

Mojo C++ bindings: support sync methods - part 1.

This CL:
- adds support for [Sync] attribute;
- generates C++ sync method signatures;
- does the simplest thing to block and wait for results of sync calls. (Allows
  any messages of the same interface ptr to re-enter; disallows any messages of
  other message pipes to re-enter.)

The following will be in future CLs:
- Change the re-entrancy behavior.
- Support sync calls with associated interfaces.

BUG=577699
Committed: https://crrev.com/904b45f35fb925bab31d25e43732a947385460b6
Cr-Commit-Position: refs/heads/master@{#376023}

[yzshen1, 2016-02-17 18:50:35]

yzshen@chromium.org changed reviewers:
+ jam@chromium.org

[yzshen1, 2016-02-17 18:50:35]

Hi, John.

Would you please take a look? Thanks!

[jam, 2016-02-17 23:05:34]

lgtm

[yzshen1, 2016-02-17 23:05:55]

The CQ bit was checked by yzshen@chromium.org

[commit-bot: I haz the power, 2016-02-17 23:07:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1701423002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1701423002/1

[commit-bot: I haz the power, 2016-02-17 23:16:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-17 23:17:41]

Description was changed from

==========
Mojo C++ bindings: support sync methods - part 1.

This CL:
- adds support for [Sync] attribute;
- generates C++ sync method signatures;
- does the simplest thing to block and wait for results of sync calls. (Allows
  any messages of the same interface ptr to re-enter; disallows any messages of
  other message pipes to re-enter.)

The following will be in future CLs:
- Change the re-entrancy behavior.
- Support sync calls with associated interfaces.

BUG=577699
==========

to

==========
Mojo C++ bindings: support sync methods - part 1.

This CL:
- adds support for [Sync] attribute;
- generates C++ sync method signatures;
- does the simplest thing to block and wait for results of sync calls. (Allows
  any messages of the same interface ptr to re-enter; disallows any messages of
  other message pipes to re-enter.)

The following will be in future CLs:
- Change the re-entrancy behavior.
- Support sync calls with associated interfaces.

BUG=577699

Committed: https://crrev.com/904b45f35fb925bab31d25e43732a947385460b6
Cr-Commit-Position: refs/heads/master@{#376023}
==========

[commit-bot: I haz the power, 2016-02-17 23:17:41]

Patchset 1 (id:??) landed as
https://crrev.com/904b45f35fb925bab31d25e43732a947385460b6
Cr-Commit-Position: refs/heads/master@{#376023}