Always force the bounds of the empty pathref.

Always force the bounds of the empty pathref.

Chrome's TSAN bots are seeing various races on the bounds of the empty
path ref, and it's a simple fix to just force them on creation.  In
fact, we used to do this for this very reason, but for some reason it
looks like I decided it wasn't necessary.  Maybe not, but it certainly
doesn't hurt, and it's nice to keep TSAN happy.

Reminder to self: merge this into M39 branch too.

BUG=418299
Committed: https://skia.googlesource.com/skia/+/51936a3f07d18654be966527691067729c070bd3

[mtklein, 2014-09-27 15:13:36]

The CQ bit was checked by mtklein@google.com

[mtklein, 2014-09-27 15:13:53]

mtklein@google.com changed reviewers:
+ fmalita@chromium.org, robertphillips@google.com

[mtklein, 2014-09-27 15:13:54]

First reviewer wins!

[commit-bot: I haz the power, 2014-09-27 15:14:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/603503003/1

[commit-bot: I haz the power, 2014-09-27 15:14:25]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-09-27 21:14 UTC

[commit-bot: I haz the power, 2014-09-27 17:19:14]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-09-27 23:19 UTC

[commit-bot: I haz the power, 2014-09-27 18:03:12]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-09-28 00:03 UTC

[commit-bot: I haz the power, 2014-09-28 00:03:18]

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

[commit-bot: I haz the power, 2014-09-28 00:03:21]

No LGTM from a valid reviewer yet. Please ask for an LGTM from a
full Skia committer from
https://skia.googlesource.com/skia/+/master/CQ_COMMITTERS

[robertphillips, 2014-09-29 12:25:28]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-09-29 12:25:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/603503003/1

[commit-bot: I haz the power, 2014-09-29 12:25:41]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-09-29 18:25 UTC

[robertphillips, 2014-09-29 12:26:09]

lgtm

[commit-bot: I haz the power, 2014-09-29 12:28:02]

Committed patchset #1 (id:1) as 51936a3f07d18654be966527691067729c070bd3