[SYNC] Sessions datatype refactor. Most things related to sessions under-the-...

chrome/browser/sync/engine/syncapi.h

 // Copyright (c) 2010 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.
 
 // This file defines the "sync API", an interface to the syncer
 // backend that exposes (1) the core functionality of maintaining a consistent
 // local snapshot of a hierarchical object set; (2) a means to transactionally
 // access and modify those objects; (3) a means to control client/server
 // synchronization tasks, namely: pushing local object modifications to a
 // server, pulling nonlocal object modifications from a server to this client,
@@ skipping 134 matching lines @@
   // will return FALSE.
   virtual bool InitByClientTagLookup(syncable::ModelType model_type,
       const std::string& tag) = 0;
 
   // Each object is identified by a 64-bit id (internally, the syncable
   // metahandle).  These ids are strictly local handles.  They will persist
   // on this client, but the same object on a different client may have a
   // different ID value.
   virtual int64 GetId() const;
 
+  // Returns the modification time of the object (in TimeTicks internal format).
+  int64 GetModificationTime() const;
+
   // Nodes are hierarchically arranged into a single-rooted tree.
   // InitByRootLookup on ReadNode allows access to the root. GetParentId is
   // how you find a node's parent.
   int64 GetParentId() const;
 
   // Nodes are either folders or not.  This corresponds to the IS_DIR property
   // of syncable::Entry.
   bool GetIsFolder() const;
 
   // Returns the title of the object.
@@ skipping 803 matching lines @@
   // This allows actual HttpPostProvider subclass implementations to be
   // reference counted, which is useful if a particular implementation uses
   // multiple threads to serve network requests.
   virtual void Destroy(HttpPostProviderInterface* http) = 0;
   virtual ~HttpPostProviderFactory() { }
 };
 
 }  // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCAPI_H_