[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 19 matching lines @@
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 struct ServerConnectionEvent;
 
 struct ConfigurationParams {
-  enum KeystoreKeyStatus {
-    KEYSTORE_KEY_UNNECESSARY,
-    KEYSTORE_KEY_NEEDED
-  };
   ConfigurationParams();
   ConfigurationParams(
       const sync_pb::GetUpdatesCallerInfo::GetUpdatesSource& source,
       const syncer::ModelTypeSet& types_to_download,
       const syncer::ModelSafeRoutingInfo& routing_info,
-      KeystoreKeyStatus keystore_key_status,
       const base::Closure& ready_task);
   ~ConfigurationParams();
 
   // Source for the configuration.
   sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source;
   // The types that should be downloaded.
   syncer::ModelTypeSet types_to_download;
   // The new routing info (superset of types to be downloaded).
   ModelSafeRoutingInfo routing_info;
-  // Whether we need to perform a GetKey command.
-  KeystoreKeyStatus keystore_key_status;
   // Callback to invoke on configuration completion.
   base::Closure ready_task;
 };
 
 class SyncScheduler : public sessions::SyncSession::Delegate {
  public:
   enum Mode {
     // In this mode, the thread only performs configuration tasks.  This is
     // designed to make the case where we want to download updates for a
     // specific type only, and not continue syncing until we are moved into
@@ skipping 341 matching lines @@
   scoped_ptr<Syncer> syncer_;
 
   sessions::SyncSessionContext *session_context_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncScheduler);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_SYNC_SCHEDULER_H_