Merge "Use MetricsLogger.histogram for optimizing app statistics." into nyc-dev
am: 6795f0ba19

* commit '6795f0ba198170c5cc044e04be65dd1171d5f7a5':
  Use MetricsLogger.histogram for optimizing app statistics.

Change-Id: I2ebedbfd8e44ab563c2844c6aebf04de1dce9ed9