Web-Animations: Implement idle state for AnimationPlayers

Web-Animations: Implement idle state for AnimationPlayers

Refactor AnimationPlayer::cancel() to enter idle state rather than nullifying m_source.

Original patch[1] by shans@chromium.org

[1] https://codereview.chromium.org/534193002
BUG=396366
TBR=shans@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181564

[dstockwell, 2014-09-08 05:21:36]

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

[shans, 2014-09-08 08:35:35]

The CQ bit was checked by shans@chromium.org

[shans, 2014-09-08 08:35:35]

lgtm

[commit-bot: I haz the power, 2014-09-08 08:35:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dstockwell@chromium.org/548223002/60001

[commit-bot: I haz the power, 2014-09-08 11:37:40]

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

[commit-bot: I haz the power, 2014-09-08 11:37:41]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/26000)

[dstockwell, 2014-09-08 11:42:03]

The CQ bit was checked by dstockwell@chromium.org

[commit-bot: I haz the power, 2014-09-08 11:42:20]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dstockwell@chromium.org/548223002/60001

[commit-bot: I haz the power, 2014-09-08 13:59:22]

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

[commit-bot: I haz the power, 2014-09-08 13:59:24]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/26016)

[dstockwell, 2014-09-08 14:28:37]

The CQ bit was checked by dstockwell@chromium.org

[commit-bot: I haz the power, 2014-09-08 14:29:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dstockwell@chromium.org/548223002/60001

[commit-bot: I haz the power, 2014-09-08 15:07:27]

Committed patchset #4 (id:60001) as 181564