Increase the scheduled_test timeout for pub tests.
Increase the scheduled_test timeout for pub tests.

R=rnystrom@google.com
BUG=15349

Review URL: https://codereview.chromium.org//92863002

git-svn-id: a962b240025cf0577aa172e20f49ccb159ba6be1@30826 260f80e4-7a28-3924-810f-c04153c831b5

computmaxer/pub,cjkao/dart-pub,dart-lang/pub,maxwellpeterson-wf/pub,dart-lang/pub