The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/f92305522780e947046640194b101602e90530ce

commit f92305522780e947046640194b101602e90530ce
Author: Ryo Hashimoto <hashimoto@google.com>
Date: Thu May 11 03:58:05 2017

cryptohome: Check xattr's presence before trying to get

Platform::GetExtendedFileAttribute() emits error logs when trying to get
non-existent xattr.
To avoid log spam, we should check the presence first.

BUG= chromium:719805 
TEST=cros_workon_make cryptohome --test

Change-Id: I660dfca58168bbeb8a22552be0b90cc275b0ea81
Reviewed-on: https://chromium-review.googlesource.com/499869
Commit-Ready: Ryo Hashimoto <hashimoto@chromium.org>
Tested-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Keigo Oka <oka@chromium.org>

[modify] https://crrev.com/f92305522780e947046640194b101602e90530ce/cryptohome/homedirs_unittest.cc
[modify] https://crrev.com/f92305522780e947046640194b101602e90530ce/cryptohome/homedirs.cc

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/6a215e39577c288f3b5e8539a4d808bbbddc78c7

commit 6a215e39577c288f3b5e8539a4d808bbbddc78c7
Author: Ryo Hashimoto <hashimoto@google.com>
Date: Mon May 15 02:31:44 2017

cryptohome: Check xattr's presence before trying to get

Platform::GetExtendedFileAttribute() emits error logs when trying to get
non-existent xattr.
To avoid log spam, we should check the presence first.

BUG= chromium:719805 
TEST=cros_workon_make cryptohome --test

Change-Id: I660dfca58168bbeb8a22552be0b90cc275b0ea81
Reviewed-on: https://chromium-review.googlesource.com/499869
Commit-Ready: Ryo Hashimoto <hashimoto@chromium.org>
Tested-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Keigo Oka <oka@chromium.org>
(cherry picked from commit f92305522780e947046640194b101602e90530ce)
Reviewed-on: https://chromium-review.googlesource.com/505969
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>

[modify] https://crrev.com/6a215e39577c288f3b5e8539a4d808bbbddc78c7/cryptohome/homedirs_unittest.cc
[modify] https://crrev.com/6a215e39577c288f3b5e8539a4d808bbbddc78c7/cryptohome/homedirs.cc