Web Animations CSS: Check if animating element exists before calculating animation update

Web Animations CSS: Check if animating element exists before calculating animation update

This was introduced in r161985 and causes LayoutTests to crash when Web Animations is enabled.

See https://codereview.chromium.org/71083002

R=timloh@chromium.org
BUG=232273, 314952, 319646
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=162164

[Timothy Loh, 2013-11-17 04:42:19]

lgtm

Sorry I missed this in my patch.

[commit-bot: I haz the power, 2013-11-17 04:42:31]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/73643003/1

[Timothy Loh, 2013-11-17 05:06:05]

Does this fix crbug.com/320042? Given our timeline re-enabling the tests won't
be too useful, but making a note on the bug might be a good idea.

[Steve Block, 2013-11-17 05:08:26]

> Does this fix crbug.com/320042?
Looking at the stack trace there, I imagine it would. But we should check.

[commit-bot: I haz the power, 2013-11-17 06:20:17]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[commit-bot: I haz the power, 2013-11-17 06:21:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/73643003/1

[commit-bot: I haz the power, 2013-11-17 06:22:35]

Change committed as 162164