chromeos: Avoid crash on thaw failure if freezing failed.

chromeos: Avoid crash on thaw failure if freezing failed.

Avoid an "Unable to thaw renderers." LOG(FATAL) in
RendererFreezer if freezing the renderers also failed
earlier. This is a workaround for unexplained EBADF and
ENOENT errors seen when writing to cgroups.

BUG=chromium:661310
TEST=manual: log in and chmod freezer.state in
     /sys/fs/cgroup/freezer/chrome_renderers/to_be_frozen
     to 444; suspend and resume and check that chrome
     doesn't abort

Review-Url: https://codereview.chromium.org/2575933002
Cr-Commit-Position: refs/heads/master@{#438625}
(cherry picked from commit d66436c2b7a48ae82eda1af894fa79b81a5ffaad)

Committed: https://chromium.googlesource.com/chromium/src/+/f0bf44baaa4b984dd3512d4f9565232919c69637

[Daniel Erat, 2016-12-15 19:03:17]

Description was changed from

==========
chromeos: Avoid crash on thaw failure if freezing failed.

Avoid an "Unable to thaw renderers." LOG(FATAL) in
RendererFreezer if freezing the renderers also failed
earlier. This is a workaround for unexplained EBADF and
ENOENT errors seen when writing to cgroups.

BUG=chromium:661310
TEST=manual: log in and chmod freezer.state in
     /sys/fs/cgroup/freezer/chrome_renderers/to_be_frozen
     to 444; suspend and resume and check that chrome
     doesn't abort

Review-Url: https://codereview.chromium.org/2575933002
Cr-Commit-Position: refs/heads/master@{#438625}
(cherry picked from commit d66436c2b7a48ae82eda1af894fa79b81a5ffaad)
==========

to

==========
chromeos: Avoid crash on thaw failure if freezing failed.

Avoid an "Unable to thaw renderers." LOG(FATAL) in
RendererFreezer if freezing the renderers also failed
earlier. This is a workaround for unexplained EBADF and
ENOENT errors seen when writing to cgroups.

BUG=chromium:661310
TEST=manual: log in and chmod freezer.state in
     /sys/fs/cgroup/freezer/chrome_renderers/to_be_frozen
     to 444; suspend and resume and check that chrome
     doesn't abort

Review-Url: https://codereview.chromium.org/2575933002
Cr-Commit-Position: refs/heads/master@{#438625}
(cherry picked from commit d66436c2b7a48ae82eda1af894fa79b81a5ffaad)

Committed:
https://chromium.googlesource.com/chromium/src/+/f0bf44baaa4b984dd3512d4f9565...
==========

[Daniel Erat, 2016-12-15 19:03:18]

Committed patchset #1 (id:1) manually as
f0bf44baaa4b984dd3512d4f9565232919c69637.