Avoid deadlock when attempting to GC during synchronous loading in a worker.

Avoid deadlock when attempting to GC during synchronous loading in a worker.

R=haraken@chromium.org, tkent@chromium.org, vegorov@chromium.org
BUG=356307
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170047

[haraken, 2014-03-26 09:45:48]

LGTM.

I'm just curious but how did you notice the bug?

[Mads Ager (chromium), 2014-03-26 09:48:26]

Have a look at the bug report: crbug.com/356307

The process is killed from the side (probably the timeout popup). The main
thread and the worker thread are deadlocked as Slava pointed out on the bug
report. I'm landing the fix for him since he is on vacation. :)

[Mads Ager (chromium), 2014-03-26 09:48:34]

The CQ bit was checked by ager@chromium.org

[commit-bot: I haz the power, 2014-03-26 09:48:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ager@chromium.org/212553002/1

[commit-bot: I haz the power, 2014-03-26 10:15:05]

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

[commit-bot: I haz the power, 2014-03-26 10:15:06]

Try jobs failed on following builders:
  tryserver.blink on win_blink_compile_dbg

[Mads Ager (chromium), 2014-03-26 10:36:15]

The CQ bit was checked by ager@chromium.org

[commit-bot: I haz the power, 2014-03-26 10:36:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ager@chromium.org/212553002/1

[commit-bot: I haz the power, 2014-03-26 10:40:16]

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

[commit-bot: I haz the power, 2014-03-26 10:40:17]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Mads Ager (chromium), 2014-03-26 10:54:15]

The CQ bit was checked by ager@chromium.org

[commit-bot: I haz the power, 2014-03-26 10:54:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ager@chromium.org/212553002/1

[commit-bot: I haz the power, 2014-03-26 11:57:49]

Change committed as 170047