YARN-2352. FairScheduler: Collect metrics on duration of critical methods that affect performance. (kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1616769 13f79535-47bb-0310-9956-ffa450edef68
YARN-2352. Add missing file. FairScheduler: Collect metrics on duration of critical methods that affect performance. (kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1616784 13f79535-47bb-0310-9956-ffa450edef68