Update StatsLogProcessor to handle BinaryPushStateChanged

Also changed StatsLog to call write() instead of the hard coded function
in StatsService.

Test: gts-tradefed run gts-dev --module GtsStatsdHostTestCases
Change-Id: I26171fa4cfc877e1e179b74ec8076d964aff8548
1 file changed
tree: 8dc16a1604b1c6269d4d9284f0ae7c0ffff6dcbd
  1. atom_field_options.proto
  2. atoms.proto