Reland r105404 with compile warning fixed.

chrome/browser/sync/glue/shared_change_processor_ref.h

Index: chrome/browser/sync/glue/shared_change_processor_ref.h
diff --git a/chrome/browser/sync/glue/shared_change_processor_ref.h b/chrome/browser/sync/glue/shared_change_processor_ref.h
new file mode 100644
index 0000000000000000000000000000000000000000..4c73bacbadf13878d011ee95ec064ab20a0911f7
--- /dev/null
+++ b/chrome/browser/sync/glue/shared_change_processor_ref.h
@@ -0,0 +1,38 @@
+// 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.
+
+#ifndef CHROME_BROWSER_SYNC_GLUE_SHARED_CHANGE_PROCESSOR_REF_H_
+#define CHROME_BROWSER_SYNC_GLUE_SHARED_CHANGE_PROCESSOR_REF_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/sync/api/sync_change_processor.h"
+#include "chrome/browser/sync/glue/shared_change_processor.h"
+
+namespace browser_sync {
+
+// A SyncChangeProcessor stub for interacting with a refcounted
+// SharedChangeProcessor.
+class SharedChangeProcessorRef : public SyncChangeProcessor {
+ public:
+  SharedChangeProcessorRef(
+      const scoped_refptr<browser_sync::SharedChangeProcessor>&
+          change_processor);
+  virtual ~SharedChangeProcessorRef();
+
+  // SyncChangeProcessor implementation.
+  virtual SyncError ProcessSyncChanges(
+      const tracked_objects::Location& from_here,
+      const SyncChangeList& change_list) OVERRIDE;
+
+  // Default copy and assign welcome (and safe due to refcounted-ness).
+
+ private:
+  scoped_refptr<browser_sync::SharedChangeProcessor> change_processor_;
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_SHARED_CHANGE_PROCESSOR_REF_H_