[Sync] Add ClearServerData support to Sync Scheduler

sync/test/engine/fake_sync_scheduler.h

Index: sync/test/engine/fake_sync_scheduler.h
diff --git a/sync/test/engine/fake_sync_scheduler.h b/sync/test/engine/fake_sync_scheduler.h
index 475a9eb57b01a2f87a0f7974b882f33d0dfb0b9f..09b7d70444cc39868a66b108a1f0e16fe5ba4ed9 100644
--- a/sync/test/engine/fake_sync_scheduler.h
+++ b/sync/test/engine/fake_sync_scheduler.h
@@ -32,6 +32,8 @@ class FakeSyncScheduler : public SyncScheduler {
       scoped_ptr<InvalidationInterface> interface,
       const tracked_objects::Location& nudge_location) override;
   void ScheduleConfiguration(const ConfigurationParams& params) override;
+  void ScheduleClearServerData(const ClearParams& params) override;
+
   void ScheduleInitialSyncNudge(syncer::ModelType model_type) override;
   void SetNotificationsEnabled(bool notifications_enabled) override;