If tree is not open ask if SkipBuildbotRuns should be used in buildbot commits 
If tree is not open ask if SkipBuildbotRuns should be used in buildbot commits 

Prompt is only displayed if tree is 'closed' or in 'caution' and if the '(SkipBuildbotRuns)' keyword is not in the description already.




git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@8723 2bbb7eff-a529-9590-31e7-b0007b416f81

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