[profiler] Introduce Tracing CPU profiler V8 API.

[profiler] Introduce Tracing CPU profiler V8 API.

Tracing CPU profiler allows V8 to automatically collect CPU profile when tracing
is started with category v8.cpu_profile2 enabled.

BUG=chromium:406277
Committed: https://crrev.com/e4e3650e8b6289bd0cd7500af6176dda81e8b585
Cr-Commit-Position: refs/heads/master@{#39855}

[alph, 2016-09-29 08:28:51]

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

[commit-bot: I haz the power, 2016-09-29 08:28:59]

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

[alph, 2016-09-29 08:29:27]

alph@chromium.org changed reviewers:
+ jochen@chromium.org

[alph, 2016-09-29 08:29:27]

Jochen, could you please take a look. Thanks.

[jochen (gone - plz use gerrit), 2016-09-29 08:57:48]

lgtm

[commit-bot: I haz the power, 2016-09-29 09:10:23]

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

[commit-bot: I haz the power, 2016-09-29 09:10:24]

Dry run: This issue passed the CQ dry run.

[alph, 2016-09-29 09:18:04]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2016-09-29 09:18:12]

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, 2016-09-29 09:24:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-29 09:25:28]

Description was changed from

==========
[profiler] Introduce Tracing CPU profiler V8 API.

Tracing CPU profiler allows V8 to automatically collect CPU profile when tracing
is started with category v8.cpu_profile2 enabled.

BUG=chromium:406277
==========

to

==========
[profiler] Introduce Tracing CPU profiler V8 API.

Tracing CPU profiler allows V8 to automatically collect CPU profile when tracing
is started with category v8.cpu_profile2 enabled.

BUG=chromium:406277

Committed: https://crrev.com/e4e3650e8b6289bd0cd7500af6176dda81e8b585
Cr-Commit-Position: refs/heads/master@{#39855}
==========

[commit-bot: I haz the power, 2016-09-29 09:25:29]

Patchset 1 (id:??) landed as
https://crrev.com/e4e3650e8b6289bd0cd7500af6176dda81e8b585
Cr-Commit-Position: refs/heads/master@{#39855}