webusb: Reject the promise if the device is already open.

webusb: Reject the promise if the device is already open.

This change adds the necessary plumbing for the USB Mojo service
implementation to detect when a device is already open and to report
this error so that the WebUSB API can reject the promise returned by
USBDevice::open() with an InvalidStateError.

BUG=492204
Committed: https://crrev.com/01bda807e1f107f607b767281c62d5f9ddb582b0
Cr-Commit-Position: refs/heads/master@{#375003}

[Reilly Grant (use Gerrit), 2016-02-11 18:42:10]

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

[Reilly Grant (use Gerrit), 2016-02-11 18:42:10]

Please take a look.

[juncai, 2016-02-11 19:25:32]

LGTM.

[Reilly Grant (use Gerrit), 2016-02-11 21:27:04]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2016-02-11 21:27:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1693433003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1693433003/1

[commit-bot: I haz the power, 2016-02-11 21:38:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-16 22:38:29]

Description was changed from

==========
webusb: Reject the promise if the device is already open.

This change adds the necessary plumbing for the USB Mojo service
implementation to detect when a device is already open and to report
this error so that the WebUSB API can reject the promise returned by
USBDevice::open() with an InvalidStateError.

BUG=492204
==========

to

==========
webusb: Reject the promise if the device is already open.

This change adds the necessary plumbing for the USB Mojo service
implementation to detect when a device is already open and to report
this error so that the WebUSB API can reject the promise returned by
USBDevice::open() with an InvalidStateError.

BUG=492204

Committed: https://crrev.com/01bda807e1f107f607b767281c62d5f9ddb582b0
Cr-Commit-Position: refs/heads/master@{#375003}
==========

[commit-bot: I haz the power, 2016-02-16 22:38:30]

Patchset 1 (id:??) landed as
https://crrev.com/01bda807e1f107f607b767281c62d5f9ddb582b0
Cr-Commit-Position: refs/heads/master@{#375003}