sync: use progress markers instead of timestamps during GetUpdates

chrome/browser/sync/engine/syncer_thread.cc

 // 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.
 #include "chrome/browser/sync/engine/syncer_thread.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_MACOSX)
 #include <CoreFoundation/CFNumber.h>
 #include <IOKit/IOTypes.h>
@@ skipping 454 matching lines @@
     return_interval.poll_delta = silenced_until_ - TimeTicks::Now();
     return return_interval;
   }
 
   bool is_continuing_sync_cyle = *continue_sync_cycle;
   *continue_sync_cycle = false;
 
   // Determine if the syncer has unfinished work to do.
   SyncSessionSnapshot* snapshot = session_context_->previous_session_snapshot();
   const bool syncer_has_work_to_do = snapshot &&
-      (snapshot->num_server_changes_remaining > snapshot->max_local_timestamp ||
-          snapshot->unsynced_count > 0);
+      (snapshot->num_server_changes_remaining > 0 ||
+       snapshot->unsynced_count > 0);
   VLOG(1) << "syncer_has_work_to_do is " << syncer_has_work_to_do;
 
   // First calculate the expected wait time, figuring in any backoff because of
   // user idle time.  next_wait is in seconds
   syncer_polling_interval_ = (!session_context_->notifications_enabled()) ?
       syncer_short_poll_interval_seconds_ :
       syncer_long_poll_interval_seconds_;
   int default_next_wait = syncer_polling_interval_;
   return_interval.poll_delta = TimeDelta::FromSeconds(default_next_wait);
 
@@ skipping 356 matching lines @@
     was_logged = true;
     VLOG(1) << "UserIdleTime unimplemented on this platform, synchronization "
                "will not throttle when user idle";
   }
 #endif
 
   return 0;
 }
 
 }  // namespace browser_sync