Deflake fast/html/imports/import-expando-gc.html

Deflake fast/html/imports/import-expando-gc.html

If a minor GC fails to identify the wrapper for the import document as
reachable, it'll be collected. Make sure that this will not happen by way
of a 'global' root.

R=haraken
BUG=503583
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197655

[sof, 2015-06-23 12:55:02]

sigbjornf@opera.com changed reviewers:
+ haraken@chromium.org, jochen@chromium.org

[sof, 2015-06-23 12:55:02]

please take a look.

I don't have a good grasp of minor GC V8GCController semantics, so I half-expect
my reasoning about root cause (sic) to be confused.

But.. this test is sensitive to GCs happening just prior to it starts creating
its wrappers. I think that might just indirectly explain why it has started
flaking.

[haraken, 2015-06-23 12:57:13]

LGTM

[sof, 2015-06-23 13:11:49]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-06-23 13:12:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1200643004/1

[sof, 2015-06-23 14:04:47]

The CQ bit was unchecked by sigbjornf@opera.com

[sof, 2015-06-23 14:11:37]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-06-23 14:12:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1200643004/1

[commit-bot: I haz the power, 2015-06-23 15:08:38]

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

[commit-bot: I haz the power, 2015-06-23 15:08:39]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/67877)

[sof, 2015-06-23 15:11:45]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-06-23 15:12:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1200643004/1

[commit-bot: I haz the power, 2015-06-23 15:15:30]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197655