This bug requires manual review: We are only 12 days from stable.
Please contact the milestone owner if you have questions.
Owners: amineer@(clank), cmasso@(bling), gkihumba@(cros), bustamante@(desktop)

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ARC++ specific code changes only.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b04a3d75750e868b4854416fd0cd6f6771b87adc

commit b04a3d75750e868b4854416fd0cd6f6771b87adc
Author: khmel <khmel@chromium.org>
Date: Thu Jan 19 21:17:58 2017

[Merge M56] arc: Restore UMA statistics for failures in LSO flow.

This restores UMA reporting for failures in preparing HTTP contexts
and also adds UMA reporting for auth failures in LSO to keep balanced
with silent auth flow. Also fixes error when error page is not shown
in case of GAIA server returns error.

BUG=b/34111604
BUG=b/34108212
BUG= 682389 
BUG= 682390 
TEST=Manually on device. Simulated error case. Made sure that UMA
     is reported and expected error page is shown
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

TBR=xiyuan@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2618603003
Cr-Commit-Position: refs/heads/master@{#441792}
(cherry picked from commit dc76842c78febcda874276d1d06971c7dbb99e9b)

Review-Url: https://codereview.chromium.org/2642763008
Cr-Commit-Position: refs/branch-heads/2924@{#804}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/b04a3d75750e868b4854416fd0cd6f6771b87adc/chrome/browser/chromeos/arc/arc_auth_service.cc
[modify] https://crrev.com/b04a3d75750e868b4854416fd0cd6f6771b87adc/chrome/browser/chromeos/arc/arc_auth_service.h
[modify] https://crrev.com/b04a3d75750e868b4854416fd0cd6f6771b87adc/chrome/browser/chromeos/arc/arc_support_host.cc
[modify] https://crrev.com/b04a3d75750e868b4854416fd0cd6f6771b87adc/chrome/browser/chromeos/arc/arc_support_host.h
[modify] https://crrev.com/b04a3d75750e868b4854416fd0cd6f6771b87adc/chrome/browser/resources/chromeos/arc_support/background.js