chromevox: Fix a racy failure in directory creation in jsbundler.py.

chromevox: Fix a racy failure in directory creation in jsbundler.py.

Previous implementation can fail if other concurrent task created the
directory between path.exists and makedirs.

BUG=655750
TEST=Manually build select_to_speak with ninja -j10 many times.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Committed: https://crrev.com/c3fd7a5f37395debb368939ef8cf3eeba32fc140
Cr-Commit-Position: refs/heads/master@{#425268}

[kinaba, 2016-10-14 06:33:26]

Description was changed from

==========
chromevox: Fix a racy failure in directory creation in jsbundler.py.

Previous implementation can fail if other concurrent task created the
directory between path.exists and makedirs.

BUG=655750
TEST=Manually build select_to_speak with ninja -j10 many times.
==========

to

==========
chromevox: Fix a racy failure in directory creation in jsbundler.py.

Previous implementation can fail if other concurrent task created the
directory between path.exists and makedirs.

BUG=655750
TEST=Manually build select_to_speak with ninja -j10 many times.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

[kinaba, 2016-10-14 06:33:40]

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

[commit-bot: I haz the power, 2016-10-14 06:33:58]

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

[kinaba, 2016-10-14 06:35:51]

kinaba@chromium.org changed reviewers:
+ dmazzoni@chromium.org

[kinaba, 2016-10-14 06:35:51]

PTAL

[commit-bot: I haz the power, 2016-10-14 06:56:30]

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

[commit-bot: I haz the power, 2016-10-14 06:56:31]

Dry run: This issue passed the CQ dry run.

[dmazzoni, 2016-10-14 07:25:39]

lgtm

[kinaba, 2016-10-14 07:27:41]

The CQ bit was checked by kinaba@chromium.org

[commit-bot: I haz the power, 2016-10-14 07:27:51]

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, 2016-10-14 07:33:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-14 07:35:54]

Description was changed from

==========
chromevox: Fix a racy failure in directory creation in jsbundler.py.

Previous implementation can fail if other concurrent task created the
directory between path.exists and makedirs.

BUG=655750
TEST=Manually build select_to_speak with ninja -j10 many times.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
==========

to

==========
chromevox: Fix a racy failure in directory creation in jsbundler.py.

Previous implementation can fail if other concurrent task created the
directory between path.exists and makedirs.

BUG=655750
TEST=Manually build select_to_speak with ninja -j10 many times.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Committed: https://crrev.com/c3fd7a5f37395debb368939ef8cf3eeba32fc140
Cr-Commit-Position: refs/heads/master@{#425268}
==========

[commit-bot: I haz the power, 2016-10-14 07:35:55]

Patchset 1 (id:??) landed as
https://crrev.com/c3fd7a5f37395debb368939ef8cf3eeba32fc140
Cr-Commit-Position: refs/heads/master@{#425268}