MAPREDUCE-2469. Task counters should also report the total heap usage of the task. (Ravi Gummadi and Amar Ramesh Kamat via amarrk)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/mapreduce/trunk@1130393 13f79535-47bb-0310-9956-ffa450edef68
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