Keisuke Kuroyanagi f6aa09df27 Refactoring: Introduce helper class to iterate runs.
This doesn't change current behavior. It's a preparation
for the following CLs.

Bug: 22408712
Change-Id: Ic018422254aa3904655f499194caad74f0c0fc5d
2015-09-29 16:05:15 -07:00
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