Fix histogram pid value

Fix histogram pid value

Use GetUniqueIdForProcess instead of GetCurrentProcId which is always
1 on Linux.

BUG=666912
Committed: https://crrev.com/6a25fa4d84368bc2316a3291e3acd4b8f493e724
Cr-Commit-Position: refs/heads/master@{#434522}

[Rick Byers, 2016-11-18 22:06:04]

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

[commit-bot: I haz the power, 2016-11-18 22:07:18]

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, 2016-11-19 00:50:08]

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

[commit-bot: I haz the power, 2016-11-19 00:50:09]

Dry run: This issue passed the CQ dry run.

[Rick Byers, 2016-11-19 16:27:40]

rbyers@chromium.org changed reviewers:
+ isherman@chromium.org

[Rick Byers, 2016-11-19 16:27:41]

isherman@ PTAL at this trivial patch

[Ilya Sherman, 2016-11-21 18:25:27]

LGTM.  I didn't really realize that we had this code :/  I wonder whether it's
actively used...

[Rick Byers, 2016-11-23 01:07:23]

On 2016/11/21 18:25:27, Ilya Sherman wrote:
> LGTM.  I didn't really realize that we had this code :/  I wonder whether it's
> actively used...

Thanks.  I assume that if anything it's used by a few metrics like what I'm
doing here: https://codereview.chromium.org/1847833003/

[Rick Byers, 2016-11-25 15:09:29]

The CQ bit was checked by rbyers@chromium.org

[commit-bot: I haz the power, 2016-11-25 15:09:46]

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, 2016-11-25 16:24:21]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480086569187120, "parent_rev":
"8c058b7befbfecda2cbbafa2049cf78ca0b940a5", "commit_rev":
"7c6c026496862cc9073a29438969cb960ea52a9c"}

[commit-bot: I haz the power, 2016-11-25 16:24:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-25 16:27:28]

Description was changed from

==========
Fix histogram pid value

Use GetUniqueIdForProcess instead of GetCurrentProcId which is always
1 on Linux.

BUG=666912
==========

to

==========
Fix histogram pid value

Use GetUniqueIdForProcess instead of GetCurrentProcId which is always
1 on Linux.

BUG=666912

Committed: https://crrev.com/6a25fa4d84368bc2316a3291e3acd4b8f493e724
Cr-Commit-Position: refs/heads/master@{#434522}
==========

[commit-bot: I haz the power, 2016-11-25 16:27:29]

Patchset 1 (id:??) landed as
https://crrev.com/6a25fa4d84368bc2316a3291e3acd4b8f493e724
Cr-Commit-Position: refs/heads/master@{#434522}