Increase the sharding parallelism for browser_tests on Mac and Windows.

Increase the sharding parallelism for browser_tests on Mac and Windows.

With the NG trybots using the buildbot value, browser_tests' sharding value regressed from the original 8 to 5 shards. The bots are now seeing more delays. Bump everything up to 10.

R=maruel@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/a5ac9e8a06e65e1292f1ab5436275220ea367991

[jam, 2014-12-15 20:33:44]

jam@chromium.org changed reviewers:
+ maruel@chromium.org

[M-A Ruel, 2014-12-15 20:36:26]

I fear 10 may be a bit on the high side which would lower the efficiency, e.g.
the time spent downloading the files vs the time spent running the test shard.
In practice, this lower efficiency could reduce overall throughput. Sadly we are
not measuring this (yet).

lgtm anyway.

[jam, 2014-12-15 20:41:03]

The CQ bit was checked by jam@chromium.org

[commit-bot: I haz the power, 2014-12-15 20:42:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/805913004/1

[jam, 2014-12-15 20:43:48]

The CQ bit was unchecked by jam@chromium.org

[commit-bot: I haz the power, 2014-12-15 20:44:01]

Patchset 1 (id:??) landed as
https://crrev.com/a5ac9e8a06e65e1292f1ab5436275220ea367991
Cr-Commit-Position: refs/heads/master@{#308408}

[jam, 2014-12-15 20:44:13]

Committed patchset #1 (id:1) manually as
a5ac9e8a06e65e1292f1ab5436275220ea367991.

[jam, 2014-12-15 20:46:06]

On 2014/12/15 20:36:26, M-A Ruel wrote:
> I fear 10 may be a bit on the high side which would lower the efficiency, e.g.
> the time spent downloading the files vs the time spent running the test shard.
> In practice, this lower efficiency could reduce overall throughput. Sadly we
are
> not measuring this (yet).

yeah I agree, I worried about this too but didn't find data on the swarming
pages showing how much is spent downloading the files.. so i thought we'd try
this out and see.

> 
> lgtm anyway.