Don't trigger Dirty.* alerts until the 2h mark
Don't trigger Dirty.* alerts until the 2h mark

Change-Id: Ic3e1352e7353309d41c0e88cb4c2c125b958b4bf
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/223307
Reviewed-by: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@google.com>

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