sync: Handle POLL jobs in separate a code path

sync/engine/sync_scheduler_impl.h

Index: sync/engine/sync_scheduler_impl.h
diff --git a/sync/engine/sync_scheduler_impl.h b/sync/engine/sync_scheduler_impl.h
index 7190bdf62113c991fd2ea1632d67c135479d4e71..1d621ecf93b4d0e5637a3cfb5095becd0f3f7a58 100644
--- a/sync/engine/sync_scheduler_impl.h
+++ b/sync/engine/sync_scheduler_impl.h
@@ -173,21 +173,22 @@ class SYNC_EXPORT_PRIVATE SyncSchedulerImpl : public SyncScheduler {
   void ScheduleSyncSessionJob(const tracked_objects::Location& loc,
                               scoped_ptr<SyncSessionJob> job);
 
-  // Invoke the Syncer to perform a sync.
+  // Invoke the Syncer to perform a non-poll job.
   bool DoSyncSessionJob(scoped_ptr<SyncSessionJob> job,
                         JobPriority priority);
 
+  // Invoke the Syncer to perform a poll job.
+  void DoPollSyncSessionJob(scoped_ptr<SyncSessionJob> job);
+
   // Called after the Syncer has performed the sync represented by |job|, to
   // reset our state.  |exited_prematurely| is true if the Syncer did not
   // cycle from job.start_step() to job.end_step(), likely because the
   // scheduler was forced to quit the job mid-way through.
-  bool FinishSyncSessionJob(scoped_ptr<SyncSessionJob> job,
+  bool FinishSyncSessionJob(SyncSessionJob* job,
                             bool exited_prematurely);
 
-  // Helper to FinishSyncSessionJob to schedule the next sync operation.
-  // |succeeded| carries the return value of |old_job|->Finish.
-  void ScheduleNextSync(scoped_ptr<SyncSessionJob> finished_job,
-                        bool succeeded);
+  // Helper to schedule retries of a failed configure or nudge job.
+  void ScheduleNextSync(scoped_ptr<SyncSessionJob> finished_job);
 
   // Helper to configure polling intervals. Used by Start and ScheduleNextSync.
   void AdjustPolling(const SyncSessionJob* old_job);