Linux sandbox: support build configuration without base test framework

Linux sandbox: support build configuration without base test framework

Support building sandbox_linux_unittests without requiring the base
test framework.

It was already supported for Android, but make it a more generic option.

BUG=488310
Committed: https://crrev.com/01954fd5da6359cab9d588caf575e68ca229719f
Cr-Commit-Position: refs/heads/master@{#330051}

[jln (very slow on Chromium), 2015-05-15 02:04:21]

jln@chromium.org changed reviewers:
+ mdempsky@chromium.org

[jln (very slow on Chromium), 2015-05-15 02:04:29]

PTAL!

[mdempsky, 2015-05-15 02:33:23]

lgtm

https://codereview.chromium.org/1147463003/diff/20001/sandbox/linux/tests/uni...
File sandbox/linux/tests/unit_tests.cc (right):

https://codereview.chromium.org/1147463003/diff/20001/sandbox/linux/tests/uni...
sandbox/linux/tests/unit_tests.cc:289: // This hack is required when a signaal
handler is installed
nit: s/signaal/signal/

[jln (very slow on Chromium), 2015-05-15 05:32:49]

The CQ bit was checked by jln@chromium.org

[jln (very slow on Chromium), 2015-05-15 05:32:50]

The patchset sent to the CQ was uploaded after l-g-t-m from
mdempsky@chromium.org
Link to the patchset: https://codereview.chromium.org/1147463003/#ps40001
(title: "Nits.")

[commit-bot: I haz the power, 2015-05-15 05:33:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1147463003/40001

[commit-bot: I haz the power, 2015-05-15 06:19:45]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-15 06:20:28]

Patchset 3 (id:??) landed as
https://crrev.com/01954fd5da6359cab9d588caf575e68ca229719f
Cr-Commit-Position: refs/heads/master@{#330051}