Migrate stats_enums.proto to core/proto/android/stats/ directory for the consistency with other enums file imported in atoms.proto Test: mma Change-Id: I79f068889ac5c34c6fd8c5966687669efb37d180
Migrate stats_enums.proto to core/proto/android/stats/ directory for the consistency with other enums file imported in atoms.proto Test: mma Change-Id: I79f068889ac5c34c6fd8c5966687669efb37d180