[webcrypto] Add layout tests for garbage collection of custom properties.

[webcrypto] Add layout tests for garbage collection of custom properties.

These tests come from WebKit's LayoutTests/crypto, with only slight modifications to work in Blink.

BUG=245025
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170284

[eroman, 2014-03-27 23:35:14]

These tests are copied from WebKit, do I need to do anything additional for
attribution?

[abarth-chromium, 2014-03-27 23:45:03]

LGTM

I don't think you need to do anything particular to attribute them.  You can ask
the original author if you want to be sure.

[eroman, 2014-03-28 00:35:27]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-03-28 00:35:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eroman@chromium.org/215763002/40001

[commit-bot: I haz the power, 2014-03-28 00:40:51]

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

[commit-bot: I haz the power, 2014-03-28 00:40:51]

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

[eroman, 2014-03-28 02:18:21]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-03-28 02:18:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eroman@chromium.org/215763002/40001

[commit-bot: I haz the power, 2014-03-28 03:22:45]

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

[commit-bot: I haz the power, 2014-03-28 03:22:46]

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

[eroman, 2014-03-28 05:23:03]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-03-28 05:23:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eroman@chromium.org/215763002/40001

[commit-bot: I haz the power, 2014-03-28 06:31:17]

Change committed as 170284