Add V8.Execute histogram to measure time spent executing JS code.

Add V8.Execute histogram to measure time spent executing JS code.

Adds a V8.Execute histogram to measure the amount of time spent executing
JS code.

BUG=v8:4865
LOG=N

Committed: https://crrev.com/e8f5a2723cf54576b84322ac2ee6ef7abc9df056
Cr-Commit-Position: refs/heads/master@{#36217}

[rmcilroy, 2016-05-12 14:02:53]

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

[commit-bot: I haz the power, 2016-05-12 14:02:55]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1974003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1974003002/1

[rmcilroy, 2016-05-12 14:03:15]

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

[rmcilroy, 2016-05-12 14:03:16]

Camillo, PTAL, thanks.

[commit-bot: I haz the power, 2016-05-12 14:35:46]

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

[commit-bot: I haz the power, 2016-05-12 14:35:46]

Dry run: This issue passed the CQ dry run.

[Camillo Bruni, 2016-05-12 16:13:34]

Ain't pretty but will do ;)
LGTM

[rmcilroy, 2016-05-12 16:59:33]

The CQ bit was checked by rmcilroy@chromium.org

[commit-bot: I haz the power, 2016-05-12 16:59:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1974003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1974003002/1

[commit-bot: I haz the power, 2016-05-12 17:12:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-12 17:12:38]

Description was changed from

==========
Add V8.Execute histogram to measure time spent executing JS code.

Adds a V8.Execute histogram to measure the amount of time spent executing
JS code.

BUG=v8:4865
LOG=N
==========

to

==========
Add V8.Execute histogram to measure time spent executing JS code.

Adds a V8.Execute histogram to measure the amount of time spent executing
JS code.

BUG=v8:4865
LOG=N

Committed: https://crrev.com/e8f5a2723cf54576b84322ac2ee6ef7abc9df056
Cr-Commit-Position: refs/heads/master@{#36217}
==========

[commit-bot: I haz the power, 2016-05-12 17:12:40]

Patchset 1 (id:??) landed as
https://crrev.com/e8f5a2723cf54576b84322ac2ee6ef7abc9df056
Cr-Commit-Position: refs/heads/master@{#36217}

[Michael Hablich, 2016-05-13 11:16:22]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1970193003/ by hablich@chromium.org.

The reason for reverting is: Blocks roll
https://codereview.chromium.org/1972303002/

Repro:
- build chromium with this CL
- out/Default/content_browsertests
--gtest_filter=AccessibilityHitTestingBrowserTest.HitTestingInIframes.