Add Domain handler with startup and shutdown stubs

Add Domain handler with startup and shutdown stubs

As per discussion this is a proposal for an api to be implemented by server to notify domains that need to be called before handling requests will be started and after it has finished

BUG=
R=brianwilkerson@google.com, danrubel@google.com

Committed: https://code.google.com/p/dart/source/detail?r=40911

[lukechurch, 2014-10-03 12:57:02]

lukechurch@google.com changed reviewers:
+ brianwilkerson@google.com, danrubel@google.com, paulberry@google.com

[lukechurch, 2014-10-03 12:57:03]

As discussed, here are some stubs to be hooked in.

I'm not sure that I'm using the right comment syntax for referring to a request.

If you would like me to delay the introduction of the stub until the hooks are
wired in, happy to do that. If there is some "WIP" marker that I should use to
indicate that they're not fully functional happy to do that as well.

Thanks

[Brian Wilkerson, 2014-10-03 13:17:44]

For the sake of domains that have no startup and/or shutdown behavior, I would
choose to declare these methods to have concrete implementations that do
nothing. Other than that, LGTM.

[lukechurch, 2014-10-03 14:05:28]

On 2014/10/03 13:17:44, Brian Wilkerson wrote:
> For the sake of domains that have no startup and/or shutdown behavior, I would
> choose to declare these methods to have concrete implementations that do
> nothing. Other than that, LGTM.

Sure - can do - If we do is there any reason to have RequestHandler as a
separate abstract class?

[lukechurch, 2014-10-03 14:21:59]

address comments.

[Brian Wilkerson, 2014-10-03 15:06:58]

> ... is there any reason to have RequestHandler as a separate abstract class?

Not that I can see, no.

[danrubel, 2014-10-04 21:12:54]

LGTM

[lukechurch, 2014-10-04 21:24:45]

Committed patchset #3 (id:40001) manually as 40911 (presubmit successful).