Experimental: Change "force build" behavior
Experimental: Change "force build" behavior

Instead of adding the buildset directly, trigger the appropriate scheduler.

R=epoger@google.com

Review URL: https://codereview.chromium.org/37853002

git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@11978 2bbb7eff-a529-9590-31e7-b0007b416f81

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