[Sync] Add ClearServerData support to Sync Scheduler

sync/test/engine/fake_sync_scheduler.cc

Index: sync/test/engine/fake_sync_scheduler.cc
diff --git a/sync/test/engine/fake_sync_scheduler.cc b/sync/test/engine/fake_sync_scheduler.cc
index 26707dc31ca00209ad82197351e422af128ef46e..1df5b855e10d0a57f0cbc826880bd8703ba8ec2d 100644
--- a/sync/test/engine/fake_sync_scheduler.cc
+++ b/sync/test/engine/fake_sync_scheduler.cc
@@ -37,6 +37,10 @@ void FakeSyncScheduler::ScheduleConfiguration(
   params.ready_task.Run();
 }
 
+void FakeSyncScheduler::ScheduleClearServerData(const ClearParams& params) {
+  NOTIMPLEMENTED();
+}
+
 void FakeSyncScheduler::ScheduleInitialSyncNudge(syncer::ModelType model_type) {
 }