sync: Expose DirectoryDebugInfoEmitters in engine

sync/engine/directory_update_handler.h

 // Copyright 2014 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.
 
 #ifndef SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
 #define SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 14 matching lines @@
 namespace syncer {
 
 namespace sessions {
 class StatusController;
 }
 
 namespace syncable {
 class Directory;
 }
 
+class DirectoryTypeDebugInfoEmitter;
 class ModelSafeWorker;
 
 // This class represents the syncable::Directory's processes for requesting and
 // processing updates from the sync server.
 //
 // Each instance of this class represents a particular type in the
 // syncable::Directory.  It can store and retreive that type's progress markers.
 // It can also process a set of received SyncEntities and store their data.
 class SYNC_EXPORT_PRIVATE DirectoryUpdateHandler : public UpdateHandler {
  public:
   DirectoryUpdateHandler(syncable::Directory* dir,
                          ModelType type,
-                         scoped_refptr<ModelSafeWorker> worker);
+                         scoped_refptr<ModelSafeWorker> worker,
+                         DirectoryTypeDebugInfoEmitter* debug_info_emitter);
   virtual ~DirectoryUpdateHandler();
 
   // UpdateHandler implementation.
   virtual void GetDownloadProgress(
       sync_pb::DataTypeProgressMarker* progress_marker) const OVERRIDE;
   virtual void GetDataTypeContext(sync_pb::DataTypeContext* context) const
       OVERRIDE;
   virtual SyncerError ProcessGetUpdatesResponse(
       const sync_pb::DataTypeProgressMarker& progress_marker,
       const sync_pb::DataTypeContext& mutated_context,
@@ skipping 28 matching lines @@
 
   bool IsValidProgressMarker(
       const sync_pb::DataTypeProgressMarker& progress_marker) const;
 
   // Skips all checks and goes straight to applying the updates.
   SyncerError ApplyUpdatesImpl(sessions::StatusController* status);
 
   syncable::Directory* dir_;
   ModelType type_;
   scoped_refptr<ModelSafeWorker> worker_;
+  DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
 
   scoped_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_