Add histograms for parseAuthorStyleSheet and updateStyle

Add histograms for parseAuthorStyleSheet and updateStyle

BUG=642722
Committed: https://crrev.com/78f6cc334b7c0231a6a9a6fe6de9f7183c5796ce
Cr-Commit-Position: refs/heads/master@{#421659}

[Charlie Harrison, 2016-09-15 18:55:23]

The CQ bit was checked by csharrison@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-15 18:56:05]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Charlie Harrison, 2016-09-15 18:57:51]

csharrison@chromium.org changed reviewers:
+ esprehn@chromium.org

[Charlie Harrison, 2016-09-15 18:57:52]

esprehn@, these are two places where lazy parsing CSS properties will affect
performance. Are there other places more suitable?

[commit-bot: I haz the power, 2016-09-15 20:30:51]

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

[commit-bot: I haz the power, 2016-09-15 20:30:52]

Dry run: This issue passed the CQ dry run.

[esprehn, 2016-09-28 03:49:36]

This lgtm, note though that the bigger updateStyleAndLayoutTree function is the
full process of "style", but for what you're doing you don't need to measure it.

[Charlie Harrison, 2016-09-28 04:35:51]

csharrison@chromium.org changed reviewers:
+ holte@chromium.org

[Charlie Harrison, 2016-09-28 04:35:52]

Thanks, I hoped instrumenting just update_style would give us less noisy data.

+holte for histograms.xml

[Steven Holte, 2016-09-28 19:28:57]

lgtm

[Charlie Harrison, 2016-09-28 20:37:11]

The CQ bit was checked by csharrison@chromium.org

[commit-bot: I haz the power, 2016-09-28 20:37:32]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-28 22:19:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-28 22:22:18]

Description was changed from

==========
Add histograms for parseAuthorStyleSheet and updateStyle

BUG=642722
==========

to

==========
Add histograms for parseAuthorStyleSheet and updateStyle

BUG=642722

Committed: https://crrev.com/78f6cc334b7c0231a6a9a6fe6de9f7183c5796ce
Cr-Commit-Position: refs/heads/master@{#421659}
==========

[commit-bot: I haz the power, 2016-09-28 22:22:19]

Patchset 1 (id:??) landed as
https://crrev.com/78f6cc334b7c0231a6a9a6fe6de9f7183c5796ce
Cr-Commit-Position: refs/heads/master@{#421659}