[profiler] Introduce lightweight mode for Rutime Call Stats collection.

[profiler] Introduce lightweight mode for Rutime Call Stats collection.

In the lightweight mode it only maintains pseudo stack and does not
collect timing information. It can be used in the sampling mode.

BUG=chromium:660428
Committed: https://crrev.com/c57e54b389360b8f46bbf9dcfdc1a3cb3445e7ae
Cr-Commit-Position: refs/heads/master@{#40812}

[alph, 2016-11-03 23:01:50]

alph@chromium.org changed reviewers:
+ cbruni@chromium.org, fmeawad@chromium.org, lpy@chromium.org

[Camillo Bruni, 2016-11-04 10:38:10]

lgtm

[alph, 2016-11-04 16:51:54]

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

[commit-bot: I haz the power, 2016-11-04 16:51:59]

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

[lpy, 2016-11-04 17:07:48]

LGTM.

[fmeawad, 2016-11-04 17:08:15]

lgtm

[commit-bot: I haz the power, 2016-11-04 17:19:06]

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

[commit-bot: I haz the power, 2016-11-04 17:19:06]

Dry run: This issue passed the CQ dry run.

[alph, 2016-11-07 17:46:20]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2016-11-07 17:46:26]

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, 2016-11-07 18:13:36]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-17 22:25:06]

Description was changed from

==========
[profiler] Introduce lightweight mode for Rutime Call Stats collection.

In the lightweight mode it only maintains pseudo stack and does not
collect timing information. It can be used in the sampling mode.

BUG=chromium:660428
==========

to

==========
[profiler] Introduce lightweight mode for Rutime Call Stats collection.

In the lightweight mode it only maintains pseudo stack and does not
collect timing information. It can be used in the sampling mode.

BUG=chromium:660428

Committed: https://crrev.com/c57e54b389360b8f46bbf9dcfdc1a3cb3445e7ae
Cr-Commit-Position: refs/heads/master@{#40812}
==========

[commit-bot: I haz the power, 2016-11-17 22:25:07]

Patchset 2 (id:??) landed as
https://crrev.com/c57e54b389360b8f46bbf9dcfdc1a3cb3445e7ae
Cr-Commit-Position: refs/heads/master@{#40812}