Prevent crashing when collecting some UMA about possible crashing

Prevent crashing when collecting some UMA about possible crashing

Previously we were rethrowing exceptions which caused Chrome to
crash which threw away our UMA data. Instead return some default
values in the rare instances when we would have crashed. This
should facilitate collecting UMA on the possible crashes with
the only side effect of slightly inaccurate network information
in the rare instances where there would have been a crash.

BUG=592131
R=xunjieli

Committed: https://crrev.com/ebf40db43a06950a2900842c04a94b63f71ad201
Cr-Commit-Position: refs/heads/master@{#412886}

[pauljensen, 2016-08-18 15:16:03]

Helen, PTAL, thank you!

[xunjieli, 2016-08-18 16:06:32]

lgtm

[pauljensen, 2016-08-18 16:13:17]

The CQ bit was checked by pauljensen@chromium.org

[commit-bot: I haz the power, 2016-08-18 16:13:33]

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, 2016-08-18 17:48:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-18 17:51:06]

Description was changed from

==========
Prevent crashing when collecting some UMA about possible crashing

Previously we were rethrowing exceptions which caused Chrome to
crash which threw away our UMA data. Instead return some default
values in the rare instances when we would have crashed. This
should facilitate collecting UMA on the possible crashes with
the only side effect of slightly inaccurate network information
in the rare instances where there would have been a crash.

BUG=592131
R=xunjieli
==========

to

==========
Prevent crashing when collecting some UMA about possible crashing

Previously we were rethrowing exceptions which caused Chrome to
crash which threw away our UMA data. Instead return some default
values in the rare instances when we would have crashed. This
should facilitate collecting UMA on the possible crashes with
the only side effect of slightly inaccurate network information
in the rare instances where there would have been a crash.

BUG=592131
R=xunjieli

Committed: https://crrev.com/ebf40db43a06950a2900842c04a94b63f71ad201
Cr-Commit-Position: refs/heads/master@{#412886}
==========

[commit-bot: I haz the power, 2016-08-18 17:51:07]

Patchset 1 (id:??) landed as
https://crrev.com/ebf40db43a06950a2900842c04a94b63f71ad201
Cr-Commit-Position: refs/heads/master@{#412886}