sync: Expose DirectoryDebugInfoEmitters in engine

sync/engine/directory_commit_contributor.cc

 // 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.
 
 #include "sync/engine/directory_commit_contributor.h"
 
 #include "sync/engine/directory_commit_contribution.h"
+#include "sync/sessions/directory_type_debug_info_emitter.h"
 
 namespace syncer {
 
 DirectoryCommitContributor::DirectoryCommitContributor(
     syncable::Directory* dir,
-    ModelType type)
+    ModelType type,
+    DirectoryTypeDebugInfoEmitter* debug_info_emitter)
     : dir_(dir),
-      type_(type) {}
+      type_(type),
+      debug_info_emitter_(debug_info_emitter) {}
 
 DirectoryCommitContributor::~DirectoryCommitContributor() {}
 
 scoped_ptr<CommitContribution>
 DirectoryCommitContributor::GetContribution(size_t max_entries) {
-  return DirectoryCommitContribution::Build(dir_, type_, max_entries)
-      .PassAs<CommitContribution>();
+  return DirectoryCommitContribution::Build(
+      dir_,
+      type_,
+      max_entries,
+      debug_info_emitter_).PassAs<CommitContribution>();
 }
 
 }  // namespace syncer