Support Sync following Gaia OAuth authentication

chrome/browser/sync/util/oauth.h

Index: chrome/browser/sync/util/oauth.h
diff --git a/chrome/browser/sync/util/oauth.h b/chrome/browser/sync/util/oauth.h
new file mode 100644
index 0000000000000000000000000000000000000000..815b4c4bd7bfc1c998aeb9542114c465428a28ab
--- /dev/null
+++ b/chrome/browser/sync/util/oauth.h
@@ -0,0 +1,16 @@
+// 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_UTIL_OAUTH_H_
+#define CHROME_BROWSER_SYNC_UTIL_OAUTH_H_
+#pragma once
+
+namespace browser_sync {
+
+bool IsUsingOAuth();
+const char* SyncServiceName();
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_UTIL_OAUTH_H_