Disable WebUSB detector logic on Windows.

Disable WebUSB detector logic on Windows.

Initializing the WebUSB device detector logic causes the USB subsystem
to attempt to fully enumerate the system's USB bus. This has been found
to cause jank and hangs on Chrome's FILE thread on Windows. Disabling
this component of WebUSB while the issue is investigated.

WebUSB will continue to function but this change will prevent the issue
from impacting users who do not visit sites using it.

BUG=656702
TEST=Verified USB subsystem is not initialized on startup on Windows by
checking chrome://device-log. Verified still initialized on Linux.

Committed: https://crrev.com/dfd32df76aea1a2d4f1aad69c74ded742a2ac69b
Cr-Commit-Position: refs/heads/master@{#425867}

[Reilly Grant (use Gerrit), 2016-10-18 00:11:27]

reillyg@chromium.org changed reviewers:
+ rockot@chromium.org

[Reilly Grant (use Gerrit), 2016-10-18 00:11:27]

Please take a look. This will be merged to the M-54 and M-55 branches.

[Reilly Grant (use Gerrit), 2016-10-18 00:28:38]

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

[commit-bot: I haz the power, 2016-10-18 00:29:33]

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

[juncai, 2016-10-18 00:30:54]

juncai@chromium.org changed reviewers:
+ juncai@chromium.org

[juncai, 2016-10-18 00:30:55]

LGTM.

[Reilly Grant (use Gerrit), 2016-10-18 00:37:28]

reillyg@chromium.org changed reviewers:
- rockot@chromium.org

[Reilly Grant (use Gerrit), 2016-10-18 00:38:05]

The CQ bit was unchecked by reillyg@chromium.org

[Reilly Grant (use Gerrit), 2016-10-18 00:38:07]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2016-10-18 00:38:30]

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, 2016-10-18 01:53:11]

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

[commit-bot: I haz the power, 2016-10-18 01:53:12]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[Reilly Grant (use Gerrit), 2016-10-18 02:06:35]

The CQ bit was checked by reillyg@chromium.org

[Reilly Grant (use Gerrit), 2016-10-18 02:06:36]

The patchset sent to the CQ was uploaded after l-g-t-m from juncai@chromium.org
Link to the patchset: https://codereview.chromium.org/2422403003/#ps20001
(title: "Disable WebUSB detector unit tests on Windows.")

[commit-bot: I haz the power, 2016-10-18 02:07:01]

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, 2016-10-18 02:42:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-10-18 02:46:18]

Description was changed from

==========
Disable WebUSB detector logic on Windows.

Initializing the WebUSB device detector logic causes the USB subsystem
to attempt to fully enumerate the system's USB bus. This has been found
to cause jank and hangs on Chrome's FILE thread on Windows. Disabling
this component of WebUSB while the issue is investigated.

WebUSB will continue to function but this change will prevent the issue
from impacting users who do not visit sites using it.

BUG=656702
TEST=Verified USB subsystem is not initialized on startup on Windows by
checking chrome://device-log. Verified still initialized on Linux.
==========

to

==========
Disable WebUSB detector logic on Windows.

Initializing the WebUSB device detector logic causes the USB subsystem
to attempt to fully enumerate the system's USB bus. This has been found
to cause jank and hangs on Chrome's FILE thread on Windows. Disabling
this component of WebUSB while the issue is investigated.

WebUSB will continue to function but this change will prevent the issue
from impacting users who do not visit sites using it.

BUG=656702
TEST=Verified USB subsystem is not initialized on startup on Windows by
checking chrome://device-log. Verified still initialized on Linux.

Committed: https://crrev.com/dfd32df76aea1a2d4f1aad69c74ded742a2ac69b
Cr-Commit-Position: refs/heads/master@{#425867}
==========

[commit-bot: I haz the power, 2016-10-18 02:46:19]

Patchset 2 (id:??) landed as
https://crrev.com/dfd32df76aea1a2d4f1aad69c74ded742a2ac69b
Cr-Commit-Position: refs/heads/master@{#425867}