Only terminate latency components when no rendering is scheduled

Only terminate latency components when no rendering is scheduled

The refactoring in r307111 reversed the condition for when a given
LatencyInfo would be terminated. Restore the proper condition, which
terminates the LatencyInfo when the input event has been ack'ed and
has not caused any scheduled rendering.

Also add a couple basic smoke tests for RenderWidgetHostLatencyTracker.

Committed: https://crrev.com/30db02f950a81d68285196d98e91c56f9b761de3
Cr-Commit-Position: refs/heads/master@{#307397}

[jdduke (slow), 2014-12-08 21:29:46]

jdduke@chromium.org changed reviewers:
+ miletus@chromium.org, sievers@chromium.org

[jdduke (slow), 2014-12-08 21:29:47]

miletus@: PTAL, thanks.
sievers@ for owner approval.

[Yufeng Shen (Slow to review), 2014-12-08 22:45:48]

lgtm

[no sievers, 2014-12-09 00:40:45]

lgtm

[jdduke (slow), 2014-12-09 00:52:51]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2014-12-09 00:53:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/786113002/20001

[commit-bot: I haz the power, 2014-12-09 01:44:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-09 01:44:59]

Patchset 2 (id:??) landed as
https://crrev.com/30db02f950a81d68285196d98e91c56f9b761de3
Cr-Commit-Position: refs/heads/master@{#307397}