[counter] Properly measure own-time of runtime counters.

[counter] Properly measure own-time of runtime counters.

By keeping track of the stack of counters we can properly subtract the
subcounter times and properly measure the own-time spent in each runtime
function. This is useful to get more details for builtins like HandleApiCall
which are typical top-level entries for chome which previously prevent
measurements of sub-calls to builtins/runtime functions.

BUG=

Committed: https://crrev.com/0949bce524ef010707c1ec5c5effada7224d9305
Cr-Commit-Position: refs/heads/master@{#33901}

[Camillo Bruni, 2016-02-09 13:14:04]

Description was changed from

==========
[counter] Properly measure own-time of runtime counters.

By keeping track of the stack of counters we can properly subtract the
subcounter times and properly measure the own-time spent in each runtime
function. This is useful to get more details for builtins like HandleApiCall
which are typical top-level entries for chome which previously prevent
measurements of reentrent builtins/runtime functions.

BUG=
==========

to

==========
[counter] Properly measure own-time of runtime counters.

By keeping track of the stack of counters we can properly subtract the
subcounter times and properly measure the own-time spent in each runtime
function. This is useful to get more details for builtins like HandleApiCall
which are typical top-level entries for chome which previously prevent
measurements of sub-calls to builtins/runtime functions.

BUG=
==========

[Camillo Bruni, 2016-02-09 13:15:18]

cbruni@chromium.org changed reviewers:
+ jarin@chromium.org

[Camillo Bruni, 2016-02-09 13:15:18]

Hi Jar, PTAL.
I added support for proper own-time calculation, since under chrome the majority
of entries are eaten up by the top-level HandleApiCall-builtin, thus now showing
who's the real responsible for the time spent in the runtime.

[Jarin, 2016-02-10 10:31:23]

lgtm. Thanks for doing this properly!

[Camillo Bruni, 2016-02-11 13:21:02]

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

[commit-bot: I haz the power, 2016-02-11 13:21:11]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1681943002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1681943002/1

[commit-bot: I haz the power, 2016-02-11 13:27:30]

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

[commit-bot: I haz the power, 2016-02-11 13:27:31]

Dry run: Try jobs failed on following builders:
  v8_win_nosnap_shared_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win_nosnap_shared_compil...)

[Camillo Bruni, 2016-02-11 13:48:23]

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

[commit-bot: I haz the power, 2016-02-11 13:48:29]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1681943002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1681943002/40001

[commit-bot: I haz the power, 2016-02-11 14:35:01]

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

[commit-bot: I haz the power, 2016-02-11 14:35:01]

Dry run: This issue passed the CQ dry run.

[Camillo Bruni, 2016-02-11 14:36:01]

The CQ bit was checked by cbruni@chromium.org

[Camillo Bruni, 2016-02-11 14:36:01]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/1681943002/#ps40001
(title: "fixing type")

[commit-bot: I haz the power, 2016-02-11 14:36:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1681943002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1681943002/40001

[commit-bot: I haz the power, 2016-02-11 14:49:03]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-02-11 14:49:39]

Description was changed from

==========
[counter] Properly measure own-time of runtime counters.

By keeping track of the stack of counters we can properly subtract the
subcounter times and properly measure the own-time spent in each runtime
function. This is useful to get more details for builtins like HandleApiCall
which are typical top-level entries for chome which previously prevent
measurements of sub-calls to builtins/runtime functions.

BUG=
==========

to

==========
[counter] Properly measure own-time of runtime counters.

By keeping track of the stack of counters we can properly subtract the
subcounter times and properly measure the own-time spent in each runtime
function. This is useful to get more details for builtins like HandleApiCall
which are typical top-level entries for chome which previously prevent
measurements of sub-calls to builtins/runtime functions.

BUG=

Committed: https://crrev.com/0949bce524ef010707c1ec5c5effada7224d9305
Cr-Commit-Position: refs/heads/master@{#33901}
==========

[commit-bot: I haz the power, 2016-02-11 14:49:40]

Patchset 3 (id:??) landed as
https://crrev.com/0949bce524ef010707c1ec5c5effada7224d9305
Cr-Commit-Position: refs/heads/master@{#33901}