CC Animation: Fix pauseAnimation so it doesn't reset blink negative delays

CC Animation: Fix pauseAnimation so it doesn't reset blink negative delays.

This function is used only for testing.

BUG=509482
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/408db8e06a467aebd58c9b7a0dd0192922fd90b7
Cr-Commit-Position: refs/heads/master@{#341253}

[loyso (OOO), 2015-07-28 08:00:23]

loyso@chromium.org changed reviewers:
+ ajuma@chromium.org, vollick@chromium.org

[ajuma, 2015-07-28 13:04:52]

Please add a unit test for this.

[ajuma, 2015-07-30 13:07:15]

Thanks for the nice test, lgtm.

[loyso (OOO), 2015-07-31 00:07:29]

The CQ bit was checked by loyso@chromium.org

[commit-bot: I haz the power, 2015-07-31 00:08:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1255883006/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1255883006/20001

[commit-bot: I haz the power, 2015-07-31 01:08:23]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-31 01:09:04]

Patchset 2 (id:??) landed as
https://crrev.com/408db8e06a467aebd58c9b7a0dd0192922fd90b7
Cr-Commit-Position: refs/heads/master@{#341253}