sync: Add GetAllSyncData to sync/api

chrome/browser/sync/glue/shared_change_processor.h

Index: chrome/browser/sync/glue/shared_change_processor.h
diff --git a/chrome/browser/sync/glue/shared_change_processor.h b/chrome/browser/sync/glue/shared_change_processor.h
index b6afe772020c9c498b5ee9d75b666a413ca95932..dccac666f096881f794006bd0117acd74bc907f5 100644
--- a/chrome/browser/sync/glue/shared_change_processor.h
+++ b/chrome/browser/sync/glue/shared_change_processor.h
@@ -25,7 +25,7 @@ class SyncData;
 class SyncableService;
 
 typedef std::vector<syncer::SyncData> SyncDataList;
-}  // namespace
+}  // namespace syncer
 
 namespace browser_sync {
 
@@ -79,12 +79,14 @@ class SharedChangeProcessor
 
   // GenericChangeProcessor stubs (with disconnect support).
   // Should only be called on the same thread the datatype resides.
-  virtual syncer::SyncError GetSyncData(
-      syncer::SyncDataList* current_sync_data);
   virtual int GetSyncCount();
   virtual syncer::SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const syncer::SyncChangeList& change_list);
+  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const;
+  virtual syncer::SyncError GetAllSyncDataReturnError(
+      syncer::ModelType type,
+      syncer::SyncDataList* data) const;
   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes);
   virtual bool CryptoReadyIfNecessary();