Fix initial USB enumeration on Linux to return all devices.

Fix initial USB enumeration on Linux to return all devices.

This patch fixes an issue where the first enumeration of USB devices on
Linux would only return a single device and observers would not be
notified of additional devices. This was because the logic to determine
if enumeration callbacks should be called was checking only that all
previously seen devices (of which there was only one at that point) were
ready and not that the sysfs tree had been completely walked.

BUG=662486
Committed: https://crrev.com/5c30282c70ec5f7f92129589fbbc84fef5738454
Cr-Commit-Position: refs/heads/master@{#434718}

[Reilly Grant (use Gerrit), 2016-11-24 01:03:40]

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

[Reilly Grant (use Gerrit), 2016-11-24 01:03:40]

Please take a look.

[Reilly Grant (use Gerrit), 2016-11-24 01:05:04]

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

[commit-bot: I haz the power, 2016-11-24 01:06:10]

Dry run: 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, 2016-11-24 03:07:57]

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

[commit-bot: I haz the power, 2016-11-24 03:07:58]

Dry run: Try jobs failed on following builders:
  blimp_linux_dbg on master.tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  cast_shell_linux on master.tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  chromeos_amd64-generic_chromium_compile_only_ng on
master.tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  chromeos_daisy_chromium_compile_only_ng on master.tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  chromeos_x86-generic_chromium_compile_only_ng on
master.tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  chromium_presubmit on master.tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  linux_chromium_chromeos_compile_dbg_ng on master.tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_clobber_rel_ng on master.tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_compile_dbg_ng on master.tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)

[juncai, 2016-11-28 18:42:52]

LGTM.

[Reilly Grant (use Gerrit), 2016-11-28 19:07:11]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2016-11-28 19:08:32]

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, 2016-11-28 21:06:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480360031886780, "parent_rev":
"a05b5ef8c89aa47a184dfa5ba51269c3f9fb2b05", "commit_rev":
"c35e3a0297dcc42af154777419a4935e8a98e839"}

[commit-bot: I haz the power, 2016-11-28 21:07:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-28 21:10:21]

Description was changed from

==========
Fix initial USB enumeration on Linux to return all devices.

This patch fixes an issue where the first enumeration of USB devices on
Linux would only return a single device and observers would not be
notified of additional devices. This was because the logic to determine
if enumeration callbacks should be called was checking only that all
previously seen devices (of which there was only one at that point) were
ready and not that the sysfs tree had been completely walked.

BUG=662486
==========

to

==========
Fix initial USB enumeration on Linux to return all devices.

This patch fixes an issue where the first enumeration of USB devices on
Linux would only return a single device and observers would not be
notified of additional devices. This was because the logic to determine
if enumeration callbacks should be called was checking only that all
previously seen devices (of which there was only one at that point) were
ready and not that the sysfs tree had been completely walked.

BUG=662486

Committed: https://crrev.com/5c30282c70ec5f7f92129589fbbc84fef5738454
Cr-Commit-Position: refs/heads/master@{#434718}
==========

[commit-bot: I haz the power, 2016-11-28 21:10:22]

Patchset 1 (id:??) landed as
https://crrev.com/5c30282c70ec5f7f92129589fbbc84fef5738454
Cr-Commit-Position: refs/heads/master@{#434718}