Add a test, ServiceWorker statechange target is the installing worker.

Add a test, ServiceWorker statechange target is the installing worker.

It was not possible to write this assertion because == did not work
for ServiceWorker instances, which were created anew each time they
were marshalled to Blink. That works now.

BUG=361907
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175420

[dominicc (has gone to gerrit), 2014-06-02 04:50:50]

PTAL

This depends on https://codereview.chromium.org/309503014/

[falken, 2014-06-02 06:06:29]

great! lgtm

[dominicc (has gone to gerrit), 2014-06-03 13:19:34]

The CQ bit was checked by dominicc@chromium.org

[commit-bot: I haz the power, 2014-06-03 13:20:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dominicc@chromium.org/311573002/1

[commit-bot: I haz the power, 2014-06-03 14:19:57]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/1...)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/10065)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/12231)

[commit-bot: I haz the power, 2014-06-03 14:49:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-03 14:49:05]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/1...)

[dominicc (has gone to gerrit), 2014-06-04 00:59:28]

The CQ bit was checked by dominicc@chromium.org

[commit-bot: I haz the power, 2014-06-04 01:00:31]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dominicc@chromium.org/311573002/1

[commit-bot: I haz the power, 2014-06-04 01:43:30]

Change committed as 175420