[Sync] Add support for proxy types

sync/engine/download_updates_command.cc

 // Copyright 2012 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 "sync/engine/download_updates_command.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "sync/engine/syncer.h"
@@ skipping 59 matching lines @@
   const ModelTypeSet enabled_types =
       GetRoutingInfoTypes(session->routing_info());
   DVLOG(1) << "Getting updates for types "
            << ModelTypeSetToString(enabled_types);
   DCHECK(!enabled_types.Empty());
 
   const ModelTypeInvalidationMap& invalidation_map =
       session->source().types;
   for (ModelTypeSet::Iterator it = enabled_types.First();
        it.Good(); it.Inc()) {
+    if (ProxyTypes().Has(it.Get()))
+      continue;
     sync_pb::DataTypeProgressMarker* progress_marker =
         get_updates->add_from_progress_marker();
     dir->GetDownloadProgress(it.Get(), progress_marker);
 
     // Set notification hint if present.
     ModelTypeInvalidationMap::const_iterator find_it =
         invalidation_map.find(it.Get());
     if (find_it != invalidation_map.end()) {
       progress_marker->set_notification_hint(find_it->second.payload);
     }
@@ skipping 67 matching lines @@
     // could be null in some unit tests.
     if (session->context()->debug_info_getter()) {
       session->context()->debug_info_getter()->GetAndClearDebugInfo(
           debug_info);
     }
     session->mutable_status_controller()->set_debug_info_sent();
   }
 }
 
 }  // namespace syncer