Improve tracing for sibling style invalidation

Improve tracing for sibling style invalidation

The trace event is associated with the element that was updated,
instead of incorrectly being associated with the element's parent.

BUG=378135
Committed: https://crrev.com/1b59e494cf771a62a65c9fec8dec485b4c487bb4
Cr-Commit-Position: refs/heads/master@{#361292}

[Eric Willigers, 2015-11-24 01:58:20]

ericwilligers@chromium.org changed reviewers:
+ timloh@chromium.org

[Eric Willigers, 2015-11-24 01:58:20]

Fix requested in the review comment

https://codereview.chromium.org/1317533002/diff/690001/third_party/WebKit/Sou...

[Timothy Loh, 2015-11-24 03:15:23]

lgtm

[Eric Willigers, 2015-11-24 03:20:34]

The CQ bit was checked by ericwilligers@chromium.org

[commit-bot: I haz the power, 2015-11-24 03:23:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1473093002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1473093002/1

[commit-bot: I haz the power, 2015-11-24 05:06:02]

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

[commit-bot: I haz the power, 2015-11-24 05:06:02]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Eric Willigers, 2015-11-24 08:15:54]

The CQ bit was checked by ericwilligers@chromium.org

[commit-bot: I haz the power, 2015-11-24 08:16:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1473093002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1473093002/1

[commit-bot: I haz the power, 2015-11-24 08:44:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-24 08:45:39]

Patchset 1 (id:??) landed as
https://crrev.com/1b59e494cf771a62a65c9fec8dec485b4c487bb4
Cr-Commit-Position: refs/heads/master@{#361292}