ServiceWorker: Queue tasks until the registration proxy becomes ready

ServiceWorker: Queue tasks until the registration proxy becomes ready

In [[Install]] algo. of the latest spec, register() resolves a promise
with a registration object after the worker enters the installation
process. This means the registration needs to set its .installing field
before the register promise is resolved.

But, before this patch, the registration cannot do so before resolving
the register promise because its proxy is set when the registration is
passed to the blink.

This change makes the registration queue notifications of worker version
and 'updatefound'. Once the proxy becomes ready, the registration handles
them.

Spec: https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#installation-algorithm


BUG=399533, 406240
TEST=content_unittests --gtest_filter=ServiceWorker*
TEST=run_webkit_tests.py http/tests/serviceworker

Committed: https://crrev.com/850e832d6e311d3ceec0d6da592f52b112c84ec9
Cr-Commit-Position: refs/heads/master@{#292535}

[nhiroki, 2014-08-28 11:41:45]

Patchset #1 (id:1) has been deleted

[nhiroki, 2014-08-28 11:45:15]

nhiroki@chromium.org changed reviewers:
+ horo@chromium.org, michaeln@chromium.org

[nhiroki, 2014-08-28 11:50:34]

Ptal, thanks!

[nhiroki, 2014-08-28 11:59:34]

fyi: I'm making another CL (https://codereview.chromium.org/517493002/) to
update the installation process based on this CL.

This queuing mechanism is also necessary to implement 'ready' and
getRegistration() because those APIs may want to create a new registration
object and set its version attributes before the registration proxy gets ready.

[michaeln, 2014-08-29 00:32:09]

lgtm

[nhiroki, 2014-08-29 00:38:39]

The CQ bit was checked by nhiroki@chromium.org

[commit-bot: I haz the power, 2014-08-29 00:39:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/nhiroki@chromium.org/516873002/40001

[commit-bot: I haz the power, 2014-08-29 01:22:25]

Committed patchset #2 (id:40001) as 555867abf933c40902978902e263d8926d828655

[commit-bot: I haz the power, 2014-09-10 03:04:48]

Patchset 2 (id:??) landed as
https://crrev.com/850e832d6e311d3ceec0d6da592f52b112c84ec9
Cr-Commit-Position: refs/heads/master@{#292535}