[Sync] Clean up sync logging

chrome/browser/sync/engine/syncer.cc

 // Copyright (c) 2011 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.h"
 
 #include "base/message_loop.h"
 #include "base/time.h"
 #include "chrome/browser/sync/engine/apply_updates_command.h"
 #include "chrome/browser/sync/engine/build_and_process_conflict_sets_command.h"
@@ skipping 250 matching lines @@
         clear_data_command.Execute(session);
         next_step = SYNCER_END;
         break;
       }
       case SYNCER_END: {
         break;
       }
       default:
         LOG(ERROR) << "Unknown command: " << current_step;
     }
+    VLOG(2) << "last step: " << last_step << ", current step: "
+            << current_step << ", next step: "
+            << next_step << ", snapshot: "
+            << session->TakeSnapshot().ToString();
     if (last_step == current_step)
       break;
     current_step = next_step;
   }
 
   VLOG(1) << "Syncer End";
+  VLOG(2) << "last step: " << last_step << ", current step: "
+          << current_step << ", next step: "
+          << next_step << ", snapshot: "
+          << session->TakeSnapshot().ToString();
   SyncerEndCommand syncer_end_command;
   syncer_end_command.Execute(session);
   return;
 }
 
 void Syncer::ProcessClientCommand(sessions::SyncSession* session) {
   const ClientToServerResponse& response =
       session->status_controller()->updates_response();
   if (!response.has_client_command())
     return;
@@ skipping 34 matching lines @@
   entry->Put(SERVER_CTIME, 0);
   entry->Put(SERVER_VERSION, 0);
   entry->Put(SERVER_IS_DIR, false);
   entry->Put(SERVER_IS_DEL, false);
   entry->Put(IS_UNAPPLIED_UPDATE, false);
   entry->Put(SERVER_SPECIFICS, sync_pb::EntitySpecifics::default_instance());
   entry->Put(SERVER_POSITION_IN_PARENT, 0);
 }
 
 }  // namespace browser_sync