root/chrome/common/metrics/variations/

[..]
  1. experiment_labels.cc
  2. experiment_labels.h
  3. experiment_labels_unittest.cc
  4. uniformity_field_trials.cc
  5. uniformity_field_trials.h
  6. variation_ids.h
  7. variations_util.cc
  8. variations_util.h
  9. variations_util_unittest.cc
[..]