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

sync/sessions/status_controller.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.
 
 // StatusController handles all counter and status related number crunching and
 // state tracking on behalf of a SyncSession.  It 'controls' the model data
 // defined in session_state.h.  The most important feature of StatusController
 // is the ScopedModelSafetyRestriction. When one of these is active, the
 // underlying data set exposed via accessors is swapped out to the appropriate
 // set for the restricted ModelSafeGroup behind the scenes.  For example, if
@@ skipping 131 matching lines @@
   }
 
   bool HasBookmarkCommitActivity() const {
     return ActiveGroupRestrictionIncludesModel(BOOKMARKS);
   }
 
   const ModelNeutralState& model_neutral_state() const {
     return model_neutral_;
   }
 
+  SyncerError last_get_key_result() const;
+
   // A toolbelt full of methods for updating counters and flags.
   void set_num_server_changes_remaining(int64 changes_remaining);
   void set_num_successful_bookmark_commits(int value);
   void increment_num_successful_commits();
   void increment_num_successful_bookmark_commits();
   void increment_num_updates_downloaded_by(int value);
   void increment_num_tombstone_updates_downloaded_by(int value);
   void increment_num_reflected_updates_downloaded_by(int value);
   void set_types_needing_local_migration(ModelTypeSet types);
   void increment_num_local_overwrites();
   void increment_num_server_overwrites();
   void set_sync_protocol_error(const SyncProtocolError& error);
+  void set_last_get_key_result(const SyncerError result);
   void set_last_download_updates_result(const SyncerError result);
   void set_commit_result(const SyncerError result);
 
   void update_conflicts_resolved(bool resolved);
   void reset_conflicts_resolved();
 
   void UpdateStartTime();
 
   void set_debug_info_sent();
 
@@ skipping 56 matching lines @@
   }
  private:
   StatusController* status_;
   DISALLOW_COPY_AND_ASSIGN(ScopedModelSafeGroupRestriction);
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_SESSIONS_STATUS_CONTROLLER_H_