cc: Fix slow LayerTreeHostAnimationTest

cc: Fix slow LayerTreeHostAnimationTest

This fixes LayerTreeHostAnimationTestAnimationsAddedToNewAndExistingLayers
whose single-thread versions were taking 4 seconds, since they couldn't
finish until there were no longer any running animations (in 
single-thread mode, having running animations means continually having
pending commits).

This removes the running animations, allowing the test to finish.

BUG=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282051

[ajuma, 2014-07-09 14:23:54]

The single-thread versions of this test now run in < 10ms locally.

https://codereview.chromium.org/378943004/diff/1/cc/trees/layer_tree_host_uni...
File cc/trees/layer_tree_host_unittest_animation.cc (right):

https://codereview.chromium.org/378943004/diff/1/cc/trees/layer_tree_host_uni...
cc/trees/layer_tree_host_unittest_animation.cc:1265:
[0]->layer_animation_controller();
Weird line breaking, but that's how git cl format wanted it.

[danakj, 2014-07-09 15:31:19]

Thanks a lot! LGTM

[danakj, 2014-07-09 15:31:21]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-07-09 15:33:10]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ajuma@chromium.org/378943004/1

[commit-bot: I haz the power, 2014-07-09 16:03:14]

Change committed as 282051