[Sync] Make BackendMigrator not wait for full sync cycles

chrome/browser/sync/engine/sync_scheduler.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/sync_scheduler.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/compiler_specific.h"
@@ skipping 988 matching lines @@
     copy.is_canary_job = is_canary_job;
     DoSyncSessionJob(copy);
   }
 }
 
 SyncSession* SyncScheduler::CreateSyncSession(const SyncSourceInfo& source) {
   DCHECK_EQ(MessageLoop::current(), sync_loop_);
   ModelSafeRoutingInfo routes;
   std::vector<ModelSafeWorker*> workers;
   session_context_->registrar()->GetModelSafeRoutingInfo(&routes);
+  VLOG(2) << "Creating sync session with routes "
+          << ModelSafeRoutingInfoToString(routes);
   session_context_->registrar()->GetWorkers(&workers);
   SyncSourceInfo info(source);
 
   SyncSession* session(new SyncSession(session_context_.get(), this, info,
       routes, workers));
 
   return session;
 }
 
 void SyncScheduler::PollTimerCallback() {
@@ skipping 86 matching lines @@
 
 #undef SVLOG_LOC
 
 #undef SVLOG
 
 #undef SLOG
 
 #undef ENUM_CASE
 
 }  // browser_sync