The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3a4044706b783686a071046c96ba3a09ca781837

commit 3a4044706b783686a071046c96ba3a09ca781837
Author: piperc <piperc@chromium.org>
Date: Mon Mar 20 21:36:01 2017

Add support for U2fHidDevice interaction

Add U2fHidDevice class. The class has an internal state machine
to abstract to lazily connect and initialize the device upon
instruction to transact with the device.

BUG= 697282 

Review-Url: https://codereview.chromium.org/2721223002
Cr-Commit-Position: refs/heads/master@{#458196}

[modify] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/BUILD.gn
[modify] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/BUILD.gn
[modify] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/DEPS
[modify] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/u2f_device.cc
[modify] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/u2f_device.h
[add] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/u2f_hid_device.cc
[add] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/u2f_hid_device.h
[add] https://crrev.com/3a4044706b783686a071046c96ba3a09ca781837/device/u2f/u2f_hid_device_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bdce3ee117af8ea68331c572dbaa877b8d4fdcf6

commit bdce3ee117af8ea68331c572dbaa877b8d4fdcf6
Author: piperc <piperc@chromium.org>
Date: Tue Apr 18 00:13:17 2017

Add timeout task to U2F HID state machine

Setup timeout tasks for any calls to HID layer. If a particular
device hangs or the OS does not respond in a timely manner,
continue trying other devices.

BUG= 697282 

Review-Url: https://codereview.chromium.org/2824803003
Cr-Commit-Position: refs/heads/master@{#465072}

[modify] https://crrev.com/bdce3ee117af8ea68331c572dbaa877b8d4fdcf6/device/u2f/u2f_device.h
[modify] https://crrev.com/bdce3ee117af8ea68331c572dbaa877b8d4fdcf6/device/u2f/u2f_hid_device.cc
[modify] https://crrev.com/bdce3ee117af8ea68331c572dbaa877b8d4fdcf6/device/u2f/u2f_hid_device.h