Parse hprof alloc sites after runs

Parse and report hprof allocation sites to get some
memory information about the run.
Report them as metrics.

Test: unit tests,
/tradefed.sh run google/tf/local-unit-launcher --template:map
reporters=google/template/reporters/hybrid-reporters
--hprof-heap-memory --max-run-time 30m --test-tag hprof-tf-local
--folder-path .
Bug: 37777349

Change-Id: I58e84c36696fafd1d905fcb15f26e10cfbf1ca91
(cherry picked from commit ceedb3941ac0c07b9571f0fc12fb994924918eb1)
4 files changed