root/sync/android/java/src/org/chromium/sync/notifier/

[..]
  1. InvalidationClientNameGenerator.java
  2. InvalidationClientNameProvider.java
  3. InvalidationIntentProtocol.java
  4. InvalidationPreferences.java
  5. InvalidationService.java
  6. RandomizedInvalidationClientNameGenerator.java
  7. SyncContentResolverDelegate.java
  8. SyncStatusHelper.java
  9. SystemSyncContentResolverDelegate.java
[..]