Increase timeout for Update step
Increase timeout for Update step

Trybots are hitting the timeout since they have to check out more than the
regular builders.
Review URL: https://codereview.appspot.com/7073049

git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@7103 2bbb7eff-a529-9590-31e7-b0007b416f81

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot