Expose CrossThreadPersistent assignment operators.

Expose CrossThreadPersistent assignment operators.

Allow the base class Persistent assignment operators to be used over
CrossThreadPersistent also.

R=haraken@chromium.org
BUG=347902
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169315

[sof, 2014-03-16 08:38:51]

Please take a look.

Trunk currently doesn't compile with Oilpan enabled, so please have a look
sooner. Issue brought to the fore by
http://crrev.com/196533003

[haraken, 2014-03-16 08:40:45]

LGTM

[sof, 2014-03-16 08:42:03]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-03-16 08:42:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/196383024/1

[commit-bot: I haz the power, 2014-03-16 08:52:35]

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

[commit-bot: I haz the power, 2014-03-16 08:52:36]

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

[sof, 2014-03-16 11:54:24]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-03-16 11:54:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/196383024/1

[commit-bot: I haz the power, 2014-03-16 12:59:04]

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

[commit-bot: I haz the power, 2014-03-16 12:59:05]

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

[sof, 2014-03-16 13:10:19]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-03-16 13:10:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/196383024/1

[commit-bot: I haz the power, 2014-03-16 22:43:15]

Change committed as 169315

[tkent, 2014-03-16 23:57:18]

Thanks!