Add tracing to custom elements operations

Add tracing to custom elements operations

This adds traces in the 'blink' category to:

- customElements.define (which could take arbitrarily long given upgrades)
- HTMLConstructor (which is unavoidable cost per-instance, so of interest)
- reaction queue invoking (you could probably work this out from JS stacks, but
  it is an interesting landmark and its overhead may be of interest)

BUG=659918
Committed: https://crrev.com/82e96780380b30193a27d412282cda8ca103c382
Cr-Commit-Position: refs/heads/master@{#428924}

[dominicc (has gone to gerrit), 2016-10-31 00:36:00]

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

[commit-bot: I haz the power, 2016-10-31 00:36:06]

Dry run: 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, 2016-10-31 00:37:35]

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

[commit-bot: I haz the power, 2016-10-31 00:37:36]

Dry run: Try jobs failed on following builders:
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[dominicc (has gone to gerrit), 2016-10-31 00:40:52]

Description was changed from

==========
Add tracing to customElements.define and the HTMLConstructor

BUG=659918
==========

to

==========
Add tracing to custom elements operations

This adds traces in the 'blink' category to:

- customElements.define (which could take arbitrarily long given upgrades)
- HTMLConstructor (which is unavoidable cost per-instance, so of interest)
- reaction queue invoking (you could probably work this out from JS stacks, but
  it is an interesting landmark and its overhead may be of interest)

BUG=659918
==========

[dominicc (has gone to gerrit), 2016-10-31 00:40:52]

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

[dominicc (has gone to gerrit), 2016-10-31 00:41:46]

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

[commit-bot: I haz the power, 2016-10-31 00:41:55]

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

[dominicc (has gone to gerrit), 2016-10-31 00:44:12]

PTAL

[commit-bot: I haz the power, 2016-10-31 01:52:12]

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

[commit-bot: I haz the power, 2016-10-31 01:52:16]

Dry run: This issue passed the CQ dry run.

[haraken, 2016-10-31 08:32:01]

LGTM.

(Elliott is ooo.)

[dominicc (has gone to gerrit), 2016-11-01 01:31:44]

The CQ bit was checked by dominicc@chromium.org

[commit-bot: I haz the power, 2016-11-01 01:32:02]

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

[dominicc (has gone to gerrit), 2016-11-01 01:32:07]

On 2016/10/31 at 08:32:01, haraken wrote:
> LGTM.
> 
> (Elliott is ooo.)

Oh, thank you for jumping in to review.

[commit-bot: I haz the power, 2016-11-01 03:24:26]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-11-01 03:27:53]

Description was changed from

==========
Add tracing to custom elements operations

This adds traces in the 'blink' category to:

- customElements.define (which could take arbitrarily long given upgrades)
- HTMLConstructor (which is unavoidable cost per-instance, so of interest)
- reaction queue invoking (you could probably work this out from JS stacks, but
  it is an interesting landmark and its overhead may be of interest)

BUG=659918
==========

to

==========
Add tracing to custom elements operations

This adds traces in the 'blink' category to:

- customElements.define (which could take arbitrarily long given upgrades)
- HTMLConstructor (which is unavoidable cost per-instance, so of interest)
- reaction queue invoking (you could probably work this out from JS stacks, but
  it is an interesting landmark and its overhead may be of interest)

BUG=659918

Committed: https://crrev.com/82e96780380b30193a27d412282cda8ca103c382
Cr-Commit-Position: refs/heads/master@{#428924}
==========

[commit-bot: I haz the power, 2016-11-01 03:27:54]

Patchset 3 (id:??) landed as
https://crrev.com/82e96780380b30193a27d412282cda8ca103c382
Cr-Commit-Position: refs/heads/master@{#428924}