Set window size when running dev_server tests to reduce the chance of flake

Set window size when running dev_server tests to reduce the chance of flake

BUG=catapult:#1745

Committed: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+/070f51d24bedc91e98dfb33159da1a330ce27a9e

[sullivan, 2015-11-13 18:26:53]

The CQ bit was checked by sullivan@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-13 18:26:57]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1444673002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1444673002/1

[sullivan, 2015-11-13 18:28:16]

sullivan@chromium.org changed reviewers:
+ beaudoin@chromium.org, nednguyen@chromium.org

[nednguyen, 2015-11-13 18:29:17]

nednguyen@google.com changed reviewers:
+ nednguyen@google.com

[nednguyen, 2015-11-13 18:29:17]

lgtm

[commit-bot: I haz the power, 2015-11-13 18:34:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-13 18:34:50]

Dry run: This issue passed the CQ dry run.

[sullivan, 2015-11-13 18:35:23]

The CQ bit was checked by sullivan@chromium.org

[commit-bot: I haz the power, 2015-11-13 18:35:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1444673002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1444673002/1

[commit-bot: I haz the power, 2015-11-13 18:36:26]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/github.com/catapult-project/catapu...