use (num_cores/2) jobs by default for telemetry unittests.

use (num_cores/2) jobs by default for telemetry unittests.

Previously we were using (num_cores/4). Let's see if we can get more
parallelism and still not overload the machine.

R=dtu@chromium.org
BUG=388256
Committed: https://crrev.com/4866abd7d1c6bfeb520ccd74ffb730ed45dd3cf3
Cr-Commit-Position: refs/heads/master@{#305163}

[Dirk Pranke, 2014-11-21 01:43:57]

dpranke@chromium.org changed reviewers:
+ tonyg@chromium.org

[Dirk Pranke, 2014-11-21 01:43:58]

Dave, Tony, I'll let you decide if you want to land this or not, or adjust the
numbers (e.g., perhaps we need to turn off running in parallel on the Mac).

Feel free to CQ if you want to try the change, or just close this if you want to
try something else.

[tonyg, 2014-11-21 01:47:34]

The CQ bit was checked by tonyg@chromium.org

[tonyg, 2014-11-21 01:47:35]

lgtm

Let's see what happens.

[commit-bot: I haz the power, 2014-11-21 01:48:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/742373002/1

[commit-bot: I haz the power, 2014-11-21 04:37:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-21 04:38:23]

Patchset 1 (id:??) landed as
https://crrev.com/4866abd7d1c6bfeb520ccd74ffb730ed45dd3cf3
Cr-Commit-Position: refs/heads/master@{#305163}

[Roger Tawa OOO till Jul 10th, 2014-11-21 17:28:48]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/748073003/ by rogerta@chromium.org.

The reason for reverting is: May be causing failures on XP Tests bot:
https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20(1)

First failure here:
https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29/build...

Speculative revert after discussions..