Move timeline get CSS AnimationPlayers W3C test into seperate file.

Move timeline get CSS AnimationPlayers W3C test into seperate file.

This test case fails in the Web Animations Polyfill (https://github.com/web-animations/web-animations-next) so we moved it to its own file. We don't want these tests to fork into a polyfill version and a blink version, so I'm replicating the change here.
BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184237

[rjwright, 2014-10-23 05:43:13]

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

[shans, 2014-10-23 06:08:58]

lgtm

[shans, 2014-10-23 06:09:03]

The CQ bit was checked by shans@chromium.org

[commit-bot: I haz the power, 2014-10-23 06:09:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/650543004/20001

[commit-bot: I haz the power, 2014-10-23 07:08:23]

Committed patchset #2 (id:20001) as 184237