[Sync] Add support for performing a GetKey on startup.

sync/engine/sync_scheduler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A class to schedule syncer tasks intelligently.
 #ifndef SYNC_ENGINE_SYNC_SCHEDULER_H_
 #define SYNC_ENGINE_SYNC_SCHEDULER_H_
 
 #include <string>
 
@@ skipping 245 matching lines @@
   };
 
   static const char* GetModeString(Mode mode);
 
   static const char* GetDecisionString(JobProcessDecision decision);
 
   // Assign |start| and |end| to appropriate SyncerStep values for the
   // specified |purpose|.
   static void SetSyncerStepsForPurpose(
       SyncSessionJob::SyncSessionJobPurpose purpose,
+      const ConfigurationParams& config_params,
       SyncerStep* start, SyncerStep* end);
 
   // Helpers that log before posting to |sync_loop_|.  These will only post
   // the task in between calls to Start/Stop.
   void PostTask(const tracked_objects::Location& from_here,
                 const char* name,
                 const base::Closure& task);
   void PostDelayedTask(const tracked_objects::Location& from_here,
                        const char* name,
                        const base::Closure& task,
@@ skipping 136 matching lines @@
   scoped_ptr<Syncer> syncer_;
 
   sessions::SyncSessionContext *session_context_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncScheduler);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_SYNC_SCHEDULER_H_