Make CSS Animations responsive to changes to their keyframe offsets

Make CSS Animations responsive to changes to their keyframe offsets

This change ensures that we force an animation update when an @keyframe
rule's keyframe offset is modified via script.

BUG=581966
Committed: https://crrev.com/24a00b1250c3df738d2b22c12a7053b822203012
Cr-Commit-Position: refs/heads/master@{#372189}

[alancutter (OOO until 2018), 2016-01-28 06:27:02]

alancutter@chromium.org changed reviewers:
+ dstockwell@chromium.org

[alancutter (OOO until 2018), 2016-01-28 06:28:59]

The CQ bit was checked by alancutter@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-01-28 06:29:31]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1649663002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1649663002/1

[dstockwell, 2016-01-28 06:59:53]

lgtm

[commit-bot: I haz the power, 2016-01-28 08:22:47]

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

[commit-bot: I haz the power, 2016-01-28 08:22:48]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[samli, 2016-01-28 22:35:23]

The CQ bit was checked by samli@chromium.org

[commit-bot: I haz the power, 2016-01-28 22:35:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1649663002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1649663002/1

[commit-bot: I haz the power, 2016-01-28 22:42:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-28 22:44:42]

Description was changed from

==========
Make CSS Animations responsive to changes to their keyframe offsets

This change ensures that we force an animation update when an @keyframe
rule's keyframe offset is modified via script.

BUG=581966
==========

to

==========
Make CSS Animations responsive to changes to their keyframe offsets

This change ensures that we force an animation update when an @keyframe
rule's keyframe offset is modified via script.

BUG=581966

Committed: https://crrev.com/24a00b1250c3df738d2b22c12a7053b822203012
Cr-Commit-Position: refs/heads/master@{#372189}
==========

[commit-bot: I haz the power, 2016-01-28 22:44:43]

Patchset 1 (id:??) landed as
https://crrev.com/24a00b1250c3df738d2b22c12a7053b822203012
Cr-Commit-Position: refs/heads/master@{#372189}