Add trace event for updateActiveStyleSheets.

Add trace event for updateActiveStyleSheets.

Added for inspecting performance changes for async stylesheet update
and show how much time stylesheet update will account for when moved to
the updateLayoutTree part of the lifecycle.

Will not be called often enough to cause a performance issue in itself.

R=mstensho@opera.com
BUG=567021
Committed: https://crrev.com/f6c2701c8ad1c3dbde1aafb69f66861dfd1159ec
Cr-Commit-Position: refs/heads/master@{#384237}

[rune, 2016-03-31 08:38:25]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[rune, 2016-03-31 08:38:34]

ptal

[commit-bot: I haz the power, 2016-03-31 08:38:41]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1843063005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1843063005/1

[commit-bot: I haz the power, 2016-03-31 09:49:58]

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

[commit-bot: I haz the power, 2016-03-31 09:49:59]

Dry run: This issue passed the CQ dry run.

[mstensho (USE GERRIT), 2016-03-31 10:01:41]

The CQ bit was checked by mstensho@opera.com

[mstensho (USE GERRIT), 2016-03-31 10:01:41]

lgtm

[commit-bot: I haz the power, 2016-03-31 10:02:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1843063005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1843063005/1

[commit-bot: I haz the power, 2016-03-31 10:07:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-31 10:08:41]

Description was changed from

==========
Add trace event for updateActiveStyleSheets.

Added for inspecting performance changes for async stylesheet update
and show how much time stylesheet update will account for when moved to
the updateLayoutTree part of the lifecycle.

Will not be called often enough to cause a performance issue in itself.

R=mstensho@opera.com
BUG=567021
==========

to

==========
Add trace event for updateActiveStyleSheets.

Added for inspecting performance changes for async stylesheet update
and show how much time stylesheet update will account for when moved to
the updateLayoutTree part of the lifecycle.

Will not be called often enough to cause a performance issue in itself.

R=mstensho@opera.com
BUG=567021

Committed: https://crrev.com/f6c2701c8ad1c3dbde1aafb69f66861dfd1159ec
Cr-Commit-Position: refs/heads/master@{#384237}
==========

[commit-bot: I haz the power, 2016-03-31 10:08:42]

Patchset 1 (id:??) landed as
https://crrev.com/f6c2701c8ad1c3dbde1aafb69f66861dfd1159ec
Cr-Commit-Position: refs/heads/master@{#384237}