Increase timeout for bench_pictures
Increase timeout for bench_pictures

bench gets 1200s, so we'll give bench_pictures the same.
Review URL: https://codereview.appspot.com/6494137

git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@5546 2bbb7eff-a529-9590-31e7-b0007b416f81

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